Regional Groups of Mössbauer Researchers - France
Reprinted from the April 2001 edition of the Mössbauer Spectroscopy Newsletter, published as part of Volume 24, Issue 4 of the Mössbauer Effect Reference and Data Journal
Le Groupe Francophone de Spectrométrie Mössbauer

The French group of Mössbauer spectroscopy, GFSM, was founded in 1979 and links a community of approximately 50 scientists (chemists, physicists, biologists, and geologists) working in about 30 different laboratories. The eight members of the scientific committee are each elected for a period of three years. The objectives of the GFSM are to promote the exchange of scientific and technical information amongst its members and to help train young scientists. The group is currently examining ways of establishing stronger ties with other Mössbauerists outside the country, and in particular with those belonging to French-speaking communities.

The main event of the GFSM is the annual meeting, which is usually held in May. It moves between the different groups, so enabling the members to become more familiar with the interests and infrastructure of the different laboratories. Moving around France also enables the members to sample the different gastronomic pleasures of the various regions. The two-day meeting consists of oral presentations, a poster session, a display of scientific equipment, and a visit to the local laboratory and to adjacent large-scale facilities (for example, the Intense Pulsed Field Laboratory at Toulouse, the Heavy Ion Accelerator at Caen). During a meeting, both the topic and the site of the next meeting are decided by the assembly following suggestions made by the different groups. The scientific content of the meeting is then refined by the organising group in conjunction with the scientific committee.

In the past, the meetings have concerned specific “hot” topics (spin electronics, magnetic multilayers, high Tc superconductors, relaxation phenomena, etc.) as well as themes for which the use of Mössbauer spectroscopy could be developed further (biology, semiconductors, etc.). For the latter, the group invites specialists from outside the Mössbauer community. Time is also generally available for the discussion of material problems and for exchanging information (new instrumentation, experimental equipment, data fitting procedures, synchrotron radiation, etc.). A special emphasis is placed on the contribution of Ph.D. students and post docs, who are encouraged to present their work and who receive subsidies to attend the meeting. An annual prize is presented for the best thesis involving Mössbauer spectroscopy.

The next annual meeting will take place on the 17th and 18th of May in Rouen in Normandy (where, in 1431, 19-year-old Jeanne d’Arc was burnt at the stake) and it will center on the theme of “developing materials in the fields of Physics, Chemistry and Biology.” On the 16th of May, a one-day course has been organized for those who wish to be introduced to Mössbauer spectroscopy and to learn how it may be of use in their particular line of research.

Further information will soon be available at the Web site, currently under construction.

(Report contributed by Jean-Marc Grèneche, Université du Maine.)


Mössbauer Spectroscopy in France

In the response to a general call for information on the current Mössbauer research that is taking place in France, the following reports were received by the Mössbauer Effect Data Center.


Commissariat à l’Energie Atomique – Saclay
Gif-sur-Yvette Cedex

Names and Titles of Researchers

Dr. Pierre Bonville
Dr. J. A. Hodges

History and Areas of Research

Mössbauer spectroscopy started in Saclay in 1962 when Pierre Imbert began his thesis work on “The study of dispersion phenomena linked with the recoilless absorption of atomic nuclei” under the direction of Alfred Kastler, Nobel Laureate in Physics. His first task was to design and develop the drive and detection systems for the spectrometer. Shortly afterwards, a cryostat suitable for Mössbauer spectroscopy was designed and built. The local development of equipment, in particular that of cryostats allowing measurements to progressively lower temperatures, remained one of the interests of the group.

The 57Fe measurements that followed (both for absorbers and sources) related to the magnetic properties of various compounds and included the study of magnetic relaxation phenomena. Other Mössbauer isotopes were also used, in particular a number belonging to the rare earth series. Recent work has involved 57Fe, 117Sn, 151Eu, 155Gd, 161Dy, 166Er, 169Tm, and 170Yb. In addition to the standard cryostats enabling measurements down to 1.4 K, two 3He/4He dilution refrigerators are operational and provide base temperatures below 30 mK. Magnetic fields up to 7 T may be applied. The group comprises two scientists and two technical assistants. There are presently no visitors or Ph.D. students.

The following lists some recent and ongoing research projects.

  • Search for quantum tunneling in nanoparticles
  • Superparamagnetism in nanoparticles
  • Heavy Fermion behavior in Yb based alloys
  • Commensurate/incommensurate magnetic ordering in rare earth intermetallics
  • Magnetic properties of intermetallic and cuprate superconductors
  • Vortex lattice properties of high Tc superconductors
  • Properties of geometrically frustrated systems (spin-liquid and spin-ice phases)

Some of these studies are carried out in collaboration with the Grenoble Mössbauer Group and with colleagues from the muon spectroscopy and neutron diffraction/diffusion communities.


Commissariat à l’Energie Atomique – Grenoble
Grenoble Cedex

Names and Titles of Researchers


L-R: Jean-Pierre Sanchez, Paul Vulliet
Magnetism:

Jean-Pierre Sanchez, Deputy Director, CEA–Grenoble

Paul Vulliet, Associated Professor, Grenoble University


L-R: Claudine Jeandey, Jean-Louis Oddou

Biology:

Jean-Louis Oddou, Associated Professor, Grenoble University

Claudine Jeandey, Researcher, CNRS


Pierrette Auric
Nanostructures:

Pierrette Auric, Associated Professor, Grenoble University

Areas of Research

At CEA–Grenoble, three laboratories are involved in Mössbauer spectroscopy:

• Magnetism

The study of the magnetic and electronic properties of strongly correlated electron systems is the main subject of interest of Jean-Pierre Sanchez and Paul Vulliet. Special attention is paid to rare earth and actinide compounds, to the development of high-pressure facilities, and the use of less common Mössbauer isotopes.

• Biology

Mössbauer spectroscopy under external applied magnetic field is used by Claudine Jeandey and Jean-Louis Oddou to study the electronic structure of heme and non-heme iron protein sites, and to characterize the intermediate species which appear during enzymatic cycles (by coupling Mössbauer and freeze-quench techniques). The whole natural system will be also considered by studying, with Mössbauer spectroscopy, the way some iron proteins operate in vivo.

• Nanostructures

CEMS is mainly used by Pierrette Auric for surface and interface investigations of iron nanoparticles and multilayers with potential application in perpendicular magnetic recording.


Laboratoire de Physique de l’Etat Condensé
Université du Maine
Le Mans Cedex

Names and Titles of Researchers


L-R: Mimoun Fellah, Jean-Marc Greneche,
Moussa Grafoute, Ivan Labaye, Mohammed
Fellah, Yvon Calage, Ovidiu Crisan, Nirina
Randrianantoandro, Dominique Joly

Jean-Marc Greneche, Researcher – CNRS
Yvon Calage, Professor
Ivan Labaye, Associate Professor
Nirina Randrianantoandro, Associate Professor
Ovidiu Crisan, Post-Doctorate Fellow, Bucharest, Romania
Moussa Grafoute, Ph.D. Student, Rep. Cote d’Ivoire
Dominique Joly, Lab Technician
Mimoun Fellah, Student
Mohammed Fellah, Student

Areas of Research

The Mössbauer group at the Laboratoire de Physique de l’Etat Condensé of the University of Le Mans (as a CNRS-joined research laboratory) is composed of five permanent researchers and professors, one technician, one post-doctorate fellow, and two to three students. Numerous visiting scientists (approximately four to six per year for one to three months each) are working at the laboratory through various exchange scientific programs with Poland, Slovakia, Spain, Algeria, Colombia, Ireland, and others. The laboratory possesses both experimental facilities (four spectrometers allowing 2K-1000K 57Fe transmission Mössbauer experiments and in-magnetic field measurements (0–9T) to be performed) and computing facilities (35 biprocessors PC cluster).

The main activities are focused first on the magnetic properties of amorphous magnetic materials, magnetic nanomaterials including nanoparticles, nanostructured powders and nanocrystalline alloys (surface and interface effects), iron-based fluoride materials (frustration), and then on numeric modeling of magnetic properties of low dimensional magnetic systems based on computer simulations.


Laboratoire de Magnétisme et Applications
Groupe de Physique des Matériaux
Université de Rouen
Mont-Saint-Aignan Cedex

The Laboratoire de Magnétisme et Applications (LMA) is a part of the Groupe de Physique des Matériaux, UMR CNRS 6634, associated with CNRS, Université de Rouen, and INSA de Rouen (engineering school). Among the 15 people of the LMA, nine are especially concerned with Mössbauer spectrometry.

Names and Titles of Researchers


Front Row, L-R: Rodrique Larde, Jacques Teillet,
Thomas Verdier; Back Row, L-R: Jean-Marie
Le Breton, Abdeslem Fnidiki
Jacques Teillet, Professor, Head of the Team
Abdeslem Fnidiki, Professor
Jean-Marie Le Breton, Assistant Professor
Fabienne Richomme, Assistant Professor
Jean Pierre Lebertois, Technician
Gael Khelifati, Student
Rodrique Larde, Student
Antoine Morel, Student
Thomas Verdier, Student

Areas of Research

The LMA is concerned with microstructural (SEM, TEM, atom probe), structural (X-rays), magnetic (VSM, SQUID), and local (Mössbauer) analyses of magnetic materials and with associated numerical simulations. Aging and swift ions irradiation effects are particularly emphasized.

Present research is concerned with metallic magnetic nanomaterials:

  • Multilayers (Fe/rare earth, Fe/transition metal, magnetoresistive and magnetostrictive ML).
  • Analysis of interfaces by selective deposition of 57Fe monolayers. Irradiation or annealing effects. Anisotropy results are explained using an electronic hybridization model.
  • Nanograins by mechanical alloying (Fe-Cr alloys, hydrogen reactive alloying of NdFeB magnets, magnetoresistive nanograins).
  • Partially nanorecrystallized amorphous ribbons (finemet-type).
  • Hard magnets (oxidation, spring-magnets, new hexaferrites).

The laboratory possesses transmission Mössbauer spectrometers (TMS) ranging from 2K to 1000K, high field TMS (to 11 Tesla), and home-made CEMS (20-500K). The LMA has published approximately 40 articles in international journals dealing with the Mössbauer effect since 1998.


Laboratoire d’Analyse Spectroscopique et de Traitement de Surface des Matériaux
Université de Rouen
Mont-Saint-Aignan Cedex

Names and Titles of Researchers


L-R: François Petit, Béatrice Hannoyer,
Samuel Jouen, Virginie Nivoix, Malick Jean,
Raphaële Danoix
Dr. Béatrice Hannoyer, Professor
Dr. François Petit, Maître de Conférence
Dr. Samuel Jouen, Post-Graduate
Dr. Malick Jean, Maître de Conférence
Names and Titles of Researchers (Continued)
Dr. Virginie Nivoix, Maître de Conférence
Dr. Raphaële Danoix, Maître de Conférence

Areas of Research

The laboratory specializes in the spectroscopic analysis of the oxides of transition metals. These oxides are inorganic compounds studied for their structure-property relationships or oxides grown on metal surfaces. The analytical methods are non-destructive methods, among which appear notably optical methods.

The Mössbauer group plays a part in the following areas:

  • Study of the chemical bound (ferrites, manganites, hexaferrites)
  • Search for ways of synthesis allowing to improve some characteristics
  • Characterization of oxides in the form of thin films
  • Study of metal-ceramic interfaces
  • High temperature oxidation of metals (iron and tin alloys)
  • Atmospheric corrosion (iron and tin alloys)

The team consists of 11 teaching researchers, two post-graduates, and one technician under the direction of Béatrice Hannoyer. The laboratory possesses three spectrometers, three 3 e-conversion detectors, 10K to 1000K, and 57Fe, 119mSn.


Laboratoire de Chimie Physique et Microbiologie pour l’Environnement
Université Henri Poincaré-Nancy I
Villers-lès-Nancy Cedex

The Laboratory of Physical Chemistry and Microbiology for Environmental Science (LCPME), a mixed laboratory between CNRS and the University Henri Poincaré of Nancy, and managed by Dr. J.-J. Ehrhardt, incorporates a group of researchers working with Mössbauer spectroscopy techniques. Among them are:

Names and Titles of Researchers


L-R: C. Ruby, A. Géhin, J.-M.
Génin, G. Ona-Nguema, M.
Abdelmoula
J.-M. R. Génin, Professor
J.-C. Block, Professor
F. Jorand, Asst. Professor
M. Mullet, Asst. Professor
C. Ruby, Asst. Professor
Dr. M. Abdelmoula, Engineer
Dr. O. Benali, Visiting Scientist
B. Appenzeller, Graduate Student
S. Boursiquot, Graduate Student
A. Géhin, Graduate Student
G. Ona-Nguema, Graduate Student

History and Areas of Research

Mössbauer techniques were introduced in LCPME by moving the former Laboratory of Mössbauer Spectroscopy in Materials Science of the University of Nancy 1 in 1986. Main fields of interest thus shifted from physical metallurgy and steel properties (Fe-C, Fe-N, martensite, austenite, bainite, and iron-based alloys) and magnetism (iron-rare earth alloys) towards the corrosion of iron and steels. Presently, it is essentially concerned with the reactivity of iron species in environmental science, mineralogy, and biogenesis of iron minerals. A major and continuing topic has been the study of iron(II-III) double layered hydroxysalts (green rusts, GR) that incorporate anions such as Cl-, SO42-, CO32-. Their role in the corrosion process of steels and the development of corrosion inhibitors, e.g. phosphate, nitrite, is enhanced. But the discovery of a new mineral in hydromorphic soils – identified as a GR in 1996 – gave an impetus towards soil science. The potential of using GRs for reducing pollutants such as nitrate, chromate, and selenate is considered. In situ Mössbauer monitoring of Fe(II-III) species in the field is in course with the miniaturized spectrometer developed by G. Klingelhöfer of Mainz. Bioreduction of ferric lepidocrocite into GR by dissimilatory iron reducing bacteria was recently successful and many collaborations concerning clay minerals are under way. Other problems relative to sulfide minerals are also investigated.


Université Bordeaux I
Pessac Cedex

Names and Titles of Researchers

Léopold Fournes, University Professor, Scientific Adviser, and Technical Manager
Alain Wattiaux, Research Engineer, CNRS, Scientific Adviser, and Technical Manager

Areas of Research

  • Study of high oxidation states and electronic shell configurations in iron oxides.
  • Study of fluorides and oxyfluorides of iron, tin, and antimony.
  • Study of uranium, rare earth, or transition element-based intermetallics.
  • Use of an in situ cell to follow, by Mössbauer resonance: solid-reactions, modification of iron-based electrodes during electrochemical cycles.

Related Materials

  • Oxides
  • Halides
  • Hybrid materials
  • Metals

Available Equipment

  • Mössbauer Spectrometer (4) (Gamma Nuclear Resonance)
  • Useable radioactive sources: 57Co, 119Sn
  • Analysis as a function of temperature (4.2-800K): In situ apparatus (solid-gas reactions)
  • Electrochemical equipment (potentiostat + electrochemical cells): In situ measurements

Applications and Industrial Concerns

  • In situ study of the discharging lithium batteries
  • Catalytic processes
  • Chemical and electrochemical industries (batteries)

Collaborations

  • Laboratoire de Science et Génie des Matériaux Métalliques, École des Mines, Nancy
  • Laboratoire de Physico-chimie des Matériaux et Laboratoire de Chimie Minérale D, Montpellier
  • Service de Physique, MDIH, CEN-Grenoble
  • Laboratoire d’Archéologie des Métaux, Jarville la Malgrange
  • Institut de Synthèse et d’Étude des Matériaux (ISEM) et Département d’Électricité et d’Électronique, Université du Pays-Basque, Bilbao (Spain)
  • Département des Sciences Chimiques et Biologiques de l’Université de Lisbonne (Portugal)
  • Laboratoire d’Etudes des Matériaux en milieux agressifs de la Rochelle

Equipe Matériaux Moléculaires et Biomimétiques
Laboratoire de Chimie de Coordination du CNRS
Université Paul Sabatier
Toulouse Cedex

Names and Titles of Researchers


L-R: Pascal G. Lacroix,
Jean-Pierre Costes,
Jean-Pierre Tuchagues,
Azzedine Bousseksou
Jean-Pierre Tuchagues, Professor
Azzedine Bousseksou, Chargé de Recherche au CNRS
Jean-Pierre Costes, Chargé de Recherche au CNRS
Marie-Hélène Darbieu, Ass. Professor
Pascal La Croix, Chargé de Recherche au CNRS
Jean-Pierre Laussac, Directeur de Recherche au CNRS
Ph.D. and Post-Doctoral Students: 7

Areas of Research

The electronic structure of transition metal and lanthanide complexes having remarkable physical properties originating from ligand field characteristics, anisotropy, and magnetic interactions is the main research area of the Molecular and Biomimetic Materials Team. The goal is to explore the role of such properties within two areas–on the borders of Chemistry and Physics, molecular materials with specific properties related to molecular electronics, and on the borders of Chemistry and Biology, redox and/or catalytically active metal centers of metalloproteins and enzymes. The design and synthesis of original polydentate ligands and magnetic, Mössbauer, crystallographic, and theoretical studies are the specific keys to this research area.

  • Spin-Crossover Materials. These are coordination complexes exhibiting bistability, in other words solid materials stable in two distinct molecular states. The spin-crossover phenomenon is studied in view of its potential applications for electronic devices, information storage, and digital display. The thermal switching between the two states is studied with several techniques and modeled from vibronic Ising-like Hamiltonians. The switching from one molecular state to the other one is also investigated as a function of pressure, and by using pulsed high magnetic fields. The later investigations allow studying the dynamics of the occupied state (related to the stability of the stored information).
  • 3d-4f and 4f-4f Dinuclear Complexes. In this research area, compartmental ligands allow a general access to strictly dinuclear 3d-4f complexes. These complexes are good candidates for studying the 3d-Gd or the 3d-Ln interactions through magnetic measurements. The aim is to investigate as many 3d-Ln couples as possible in order to check if ferromagnetism is always present in such complexes. This study will then be extended to more complex systems. A similar investigation is developed for heterodinuclear 4f-4f complexes.
  • Multifunctional Nonlinear Optical (NLO) Materials. Within this area, the group explores the effect of bistability or magnetic interactions on the nonlinear optical (NLO) behavior. The main strategy is based on the design of spin-crossover materials and exchange-coupled homo/hetero di- or polynuclear systems in which the (a) metal center is involved in the NLO response. The aim is to investigate the effect of specific magnetic properties onto molecular hyperpolarizability. The effect of charge delocalization (e.g., proton or electron transfer) is also envisioned.
  • Synthetic Analogues of the Metal Core of Non-Heme Mn and Fe Enzymes. The reactivity, and magnetic, structural, and redox properties of polynuclear manganese complexes with polydentate Schiff bases are explored. The goal is to determine which characteristics are essential for obtaining synthetic analogues of specific manganese enzymes (i.e., liver arginase, Mn catalases, Mn ribonucleotide reductases, oxygen evolving complex of photosystem 2). Similarly, the properties of dinuclear iron complexes are explored with the aim of determining those of utmost importance for modeling the metal core of enzymes, such as hemerythrine, methane monooxygenase, and Fe ribonucleotide reductase. Mononuclear iron(II) and iron(III) complexes including polyimidazole and ancillary ligands are also investigated as chemical analogues of the metal center of nitrile hydratases, mono- and dioxygenases, and the non-heme photosynthetic iron.
  • Tc And Re Complexes For Nuclear Medicine. At the nanomolar scale, oxo and nitrido 99mTc coordination complexes with SN, SNN, SNO, SNNS, SNNN, and SNNO ligands are investigated as imaging agents for specific tissues (brain, kidney, heart, etc.). They are selected based on their radiolabeling yield, biodistribution studies in the rat, and on exhaustive studies of their analogous oxo and nitrido 99Tc complexes at the macroscopic scale. Those exhibiting the highest labeling yield are covalently bonded to small peptides able to bind specific tumor cell receptors and investigated as imaging agents for the corresponding tissues. Similarly, the stability of their 185/187Re analogues is investigated with the aim to target specific cancers and cure them through in situ radiotherapy with 186/188Re radiopharmaceuticals.

Competencies and Facilities

Synthesis of polydentate ligands, complexations in anaerobic atmospheres (glove box, vacuum lines, etc.), experimental and theoretical investigations of the physical properties of materials: EPR, NMR, optical spectroscopies, magnetic measurements (SQUID), X-ray structural studies, optical detection of transition phenomena as a function of temperature (4-400 K), Mössbauer spectroscopy under pressure, vibronic Hamiltonians, exact calculation of the magnetic susceptibility of polynuclear spin systems, dynamic and static simulation of Mössbauer spectra, spectroscopic and quantum chemical studies of the structure-property relationship in molecular NLO materials.

Collaborations

The group has participated in the following international collaborations:

  • E. C. Training and Mobility of Researchers programs: NOHEMIP (FMRX-CT980174), TOSS (FMRX- CT98 0199)
  • Multi-lateral (MONBUSHO [Japan-France-Germany-Italy-Switzerland]) and bilateral programs (CNRS/CONICET [Argentina]), CNRS/NSFC [China], CNRS/NHRF [Greece], CNRS/CSIR [India])

Laboratoire des Agrégats Moléculaires et Matériaux Inorganiques
Université Montpellier II
Montpellier Cedex

Names and Titles of Researchers


L-R: Jean-Claude Jumas, Manfred Womes,
Bernard Ducourant, Laurent Aldon, Robert
Fourcade, Aurélie Picard Garcia, Josette
Olivier-Fourcade, Pierre Emmanuel Lippens,
Jérôme Chouvin
Dr. Jean-Claude Jumas, Directeur de Recherche
Dr. Josette Olivier-Fourcade, Directeur de Recherche
Dr. Robert Fourcade, Professor
Dr. Pierre Emmanuel Lippens, Chargé de Recherche
Dr. Bernard Ducourant, Maître de Conférence
Dr. Laurent Aldon, Maître de Conférence
Dr. Rémi Dedryvère, Post-Doctoral Scientist
Dr. Manfred Womes, Post-Doctoral Scientist
Jérôme Chouvin, Student
Pierre Kubiak, Student
Aurélie Garcia Picard, Technician

Areas of Research

The team specializes in the physicochemistry of condensed matter, and develops basic research about “complex materials” in the field of oxides and chalcogenides of p and/or transition elements. The team’s approach combines experimental methods (X-ray diffraction, X-ray absorption, X-ray photoelectron spectroscopy, Mössbauer spectroscopy) and theoretical calculations (tight binding and DFT). Now, the team uses this approach to study new materials for lithium ion batteries and bimetallic catalyst.

The lab is equipped with four spectrometers using different sources: 57Co, 119mSn, 121mSn, and 125mTe in transmission mode (Fe, Sn, Sb, Te) and variable temperature (4–300 K) and in electron conversion mode (Fe, Sn) at room temperature. From an experimental point of view, the team develops in situ measurements for electrochemistry and catalysis. The electron density and the electric field gradient at the nucleus are calculated with both semi-empirical and ab initio methods. This provides a quantitative interpretation of the experimental values of the Mössbauer isomer shift and quadrupole splitting for complex crystalline compounds.


Laboratoire de Science et Génie des Matériaux et de Métallurgie
Ecole des Mines
Nancy Cedex

Names and Titles of Researchers


Gérard Le Caër

Pierre Delcroix
Dr. Gérard Le Caër, Directeur de Recherche au CNRS
Pierre Delcroix, Ingénieur au CNRS
Dr. Sylvie Bégin, Chargé de Recherche au CNRS
Dr. Alain Mocellin, Professor
Elodie Barraud, Ph.D. Student
Olivier Humbert, Ph.D. Student

Areas of Research

The group uses high-energy ball milling:

  • for synthesizing various kinds of materials, such as oxides, compounds (borides, carbides, silicides, stannides), alloys, and intermetallic compounds,
  • for inducing phase transformations in oxides and for inducing disordering and studying reordering of disordered ground materials,
  • for activating solids.

Ground powders are further used to produce consolidated solids such as cermets. Mechanisms of mechanical mixing and materials are investigated with various techniques, in particular with Mössbauer spectroscopy.

The Mössbauer activity (57Fe, 119Sn, CEMS) of the group is under the responsibility of Pierre Delcroix, who started long ago to work in the field under the supervision of Christian Janot and joined the group about eight years ago. The CNRS Director of Research, Gérard Le Caër, expects to move from Nancy to Rennes (in the west of France) in September 2001 to increase the weight of Statistical Physics in his activity while keeping strong links with this group in Nancy and beginning a close cooperation with Jean-Marc Greneche in Le Mans.


Laboratoire CRISMAT
Université de Caen
Caen Cedex

Names and Titles of Researchers

Pr. Bernard Raveau, Director
Dr. Annie Ducouret-Cereze, Maître de Conférences
Dr. Ninh Nguyen, Charge de Recherche au CNRS
Dr. Francis Studer, Directeur de Recherche au CNRS
Dr. Vincent Caignert, Maître de Conferences

Areas of Research

The Mössbauer group in the Laboratoire CRISMAT performs synthesis, structural studies, and physical properties of new transition metal oxides by X-ray and neutron diffractions, X-ray absorption, magnetic measurements, transmission Mössbauer spectroscopy of 57Fe, and EFG calculations. Particularly, the group studies oxides with special behavior: high Tc superconductors, CMR manganites, charge ordering compounds, and phenomenon of electron delocalization.


Laboratoire de Chimie des Solides
Institut des Matériaux Jean Rouxel
Université de Nantes
Nantes Cedex

Names and Titles of Researchers

Michel Danot, Professor
Pierre Palvadeau, Doctor
Philippe Leone, Doctor
Pavel B. Fabritchnyi, Visiting Scientist–Professor, Moscow State University; Director, Laboratory of Mössbauer Spectroscopy

Areas of Research

  • Surface-doping of magnetically-ordered oxide matrices (i.e., Cr2O3) with 119Sn diamagnetic probe: study of the oxide surface evolution upon exposure to various reactive atmospheres (H2S, HCl, Cl2, etc.). Collaboration with P.B. Fabritchnyi.
  • Organic-inorganic complexes (FeO(ABTS)2(H2O)8)
  • Lamellar double hydroxides (Ca2Fe(OH)7,nH2O)
  • Oxysulfides and misfit sulfides ((Pb2FeS3)0.58PbS2 and [(EuS)1.5]1.15NbS2; Fe, Sn, and Eu nuclei)
  • Li batteries (i.e., Li-SnO2)

Université de Poitiers
Futuroscope Cedex

Names and Titles of Researchers


Jean-Paul Eymery presents a Mössbauer
effect lesson to students, showing the
various components of a room temperature spectrometer.
Dr. Jean-Paul Eymery, Researcher, Responsible for Mössbauer Equipment and Studies in the Laboratory
Dr. Fatos Ylli, Visiting Scientist (on leave from the Institute of Nuclear Physics, Tirana, Albania)
Fabien Monteverde, Student

Areas of Research

The Mössbauer group at the Université de Poitiers works in the field of physical metallurgy, as follows:

  • Ion-implantation in intermetallic compounds
  • Iron-based thin films and multilayers
  • Structural and magnetic properties of 304L stainless steel films
  • Interdiffusion phenomena at iron/semiconductors III-V interfaces

Besides a conventional spectrometer working in transmission mode, the group also possesses two 57Fe CEMS devices, one based on a resonant counter working between 300 and 600K, and the other on a channeltron-equipped unit at 77K.


This site is supervised by Mössbauer Effect Data Center, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian 116023, China. Contact email: medc@dicp.ac.cn