Guillaume Fraysse

http://www.pzt.fr
guillaume.fraysse@univ-montp2.fr
fraysseguillaume@yahoo.fr
Institut Charles Gerhardt Montpellier, Équipe PMOF, UMR CNRS-UM2-ENSCM-UM1
University of Montpellier 2, Place Eugène Bataillon, 34095 Montpellier cedex 5, France

Current Status

I am currently doing a PhD in solid state chemistry at the Institut Charles Gerhardt Montpellier, France. My PhD defence is planned for november 2008, I should be available for employment shortly after.

I am looking for a post doctoral position within the field of science at high pressure, ferroelectrics, large scale facilities or crystallography.

Education

2005-2008: Doctoral degree in Solid State Chemistry at the University of Montpellier 2 (UM2)

2002-2004: Master's degree (Maîtrise, DEA) in Materials Science, UM2

1998-2002: Bachelor’s degree (Licence) in Fundamental Chemistry, UM2

1997-1998: High-school diploma (Baccalauréat), Lycée Théodore Aubanel, Avignon

Work Experience

Research experience:

2005-2008: PhD student in Solid State Chemistry

Pressure-Temperature-Composition phase diagrams of perovskite-type ferroelectrics PbZr_(1-x)Ti_xO₃ and relaxor-ferroelectrics (1-x)PbZn_1/3Nb_2/3O₃-xPbTiO₃.
Institut Charles Gerhardt Montpellier, University of Montpellier 2
Supervisors: Dr. Julien Haines (DR2 CNRS), Dr. Véronique Bornand (CR1 CNRS)

Research activities:

Investigations of the tilt boundary of the PbZr_(1-x)Ti_xO₃(PZT) solid solutions by means of time of flight powder neutron diffraction (Polaris, ISIS), resonance Raman spectroscopy (LCVN) and dielectric measurements (ICGM). Phase transition and symmetries of the ferroelectric phases of PbZr_0.6Ti_0.4O₃.
High-pressure behaviour of Zr-rich PZT by angle dispersive x-ray diffraction (diamond anvil cell), neutron diffraction (Paris-Edimburgh pressure cell), resonance Raman spectroscopy (DAC) and dielectric measurements (Unipress gas compressor).
In-situ investigations of the corresponding changes in short-range/long-range order and the Zr-environnment of morphotropic PbZr_0.52Ti_0.48O₃by means of combined high-pressure high-temperature EXAFS (Zr K edge)/X-ray diffraction experiments (BM29, ESRF).
Comparative study of the low-temperature vs. high-pressure behaviour of PbTiO₃-rich PZN-PT single crystals by means of resonance Raman spectroscopy, dielectric and piezoelectric measurements.

2004-2005: Research Assistant CNES, 8 months

Radiation effects on natural and synthetic alpha-quartz single crystals (CNES contract n°04/CNES/1755/00: radiation sensitivity of space ultra stable oscillators)
Time & Frequency department, Institut FEMTO-ST, Besançon, France
Supervisors: Dr. Jean-Jacques Boy (Institut FEMTO-ST), Dr. Gilles Cibiel (CNES)

2004: Master thesis, 6 months

New alpha-quartz-type materials
Institut Charles Gerhardt Montpellier, University of Montpellier 2
Supervisors: Dr. Julien Haines (CR1 CNRS), Dr. Olivier Cambon (MCF UM2)

Research activities:

Hydrothermal synthesis of alpha-quartz-type gallium arsenate GaAsO₄ and alpha-quartz-type Al_1-xGa_xPO₄ solid solutions.

Thermal stability of GaAsO₄ by means of thermal gravimetric analysis, high temperature x-ray diffraction and Rietveld refinements.

Structural study of Al_1-xGa_xPO₄single crystals as a function of composition by electron microprobe analysis and x-ray diffraction.

High-temperature piezoelectric measurements on alpha-quartz and GaPO₄ resonators.

High-temperature phase transitions study of Al_1-xGa_xPO₄ powders as a function of composition.

Teaching experience:

2007: Teaching Assistant

Graduate courses: Ceramics (80hours)
Polytech' Montpellier (School of Engineering), Montpellier
Supervisors: Dr. Caroline Vigreux, Pr. Philippe Papet

Other experience:

2008: Conference organizer, webmaster of the EWPM’2008 (http://www.ewpm.eu)

Courses:

Introduction to EXAFS X-ray absorption spectroscopy, 18-22 June 2007, Montpellier.

Neutron scattering “FAN du LLB”, 11-14 June 2007, CEA Saclay, Gif-sur-Yvette.

Other skills:

Language:

French: native language
English: good working knowledge
Italian: understanding (some stays in

Italy

)

Computing:

Rietveld refinements (GSAS, Fullprof)
Internet technologies: Joomla (CMS)

Notions of HTML

Miscellaneous:

Clean driving licence

Sports such as volley-ball, squash, tennis, skiing

Publications

G. Fraysse, J. Haines, V. Bornand, J. Rouquette, M. Pintard, Ph. Papet, S. Hull
"Low-symmetry phases at the tilt boundary of the PbZr_(1-x)Ti_xO₃ solid solution"
Physical Review B 77, 064109 (2008) [doi:10.1103/PhysRevB.77.064109]
V. Bornand, G. Fraysse, J. Haines, M. Pintard, Ph. Papet
"Dielectric investigations of PZT under high pressures and low temperatures"
Ferroelectrics 362, 14-20 (2008) [doi:10.1080/00150190801997310]
J. Haines, O. Cambon, N. Prud'homme, G. Fraysse, D. A. Keen, L.C. Chapon, M. G. Tucker
"High-temperature, structural disorder, phase transitions, and piezoelectric properties of GaPO₄"
Physical Review B 73, 014103 (2006) [doi:10.1103/PhysRevB.73.014103]
J. Haines, O. Cambon, G. Fraysse and A. van der Lee
"An X-ray powder diffraction study of the high temperature phase transitions in alpha-quartz-type AlPO₄-GaPO₄ solid solutions"
Journal of Physics: Condens. Matter 17, 4463-4474 (2005) [doi:10.1088/0953-8984/17/28/006]
O. Cambon, J. Haines, G. Fraysse, J. Détaint, B. Capelle, A. van der Lee
"Piezoelectric characterization and thermal stability of a high-performance alpha-quartz-type material, gallium arsenate"
Journal of Applied Physics 97, 074110 (2005) [doi:10.1063/1.1874293]
O. Cambon, J. Haines, G. Fraysse, D.A. Keen and M.G. Tucker
"Piezoelectric properties at high temperature in alpha-quartz materials”
Journal de Physique IV 126, 27-30 (2005) [doi: 10.1051/jp4:2005126006]
J. Haines, O. Cambon, D. Cachau-Herreillat, G. Fraysse and F.E. Mallassagne
"Single-crystal X-ray diffraction study of alpha-quartz type Al_1-xGa_xPO₄”
Solid State Sciences 6, 995-999 (2004) [doi:10.1016/j.solidstatesciences.2004.05.008]

Conferences presentations (O: oral contribution, P: poster)

            14.   (O) : "P-T studies of Pb(Zr_1-xTi_x)O₃ ferroelectric materials"
                E-MRS Fall Meeting 2008, 15-19 September 2008, Warsaw, Poland
               J. Rouquette, G. Fraysse, A. Al-Zein, V. Bornand, M. Pintard, Ph. Papet, J. Haines

           13. (O) : "Probe of the Ferroelectric-Paraelectric phase transition in the P-T space"
                    46^th EHPRG, 7-12 September 2008, Valencia, Spain
                    J. Rouquette, A. Al-Zein, G. Fraysse, Ph. Papet, J. Haines, G. Aquilanti, C. Levelut

            12. (O) : "Relaxation sous pression à la transition Ferro-Para-électrique de PbZr_0.40Ti_0.60O₃ par Spectroscopie Raman Résonante"
                    11^èmes Journées de la Matière Condensée, 25-29 août 2008, Strasbourg, France
                    J. Rouquette, A. Al-Zein, G. Fraysse, V. Bornand, M. Pintard, Ph. Papet, J. Haines, F.A. Gorelli

           11. (O) : "Evidence by XAS of the Zr shift towards the centrosymmetric position at high pressure in PbZr_0.52Ti_0.48O₃"
                    5^th European Workshop on Piezoelectric Materials, 16-18 July 2008, Montpellier, France
                    A. Al-Zein, J. Rouquette, G. Fraysse, Ph. Papet, J. Haines, G. Aquilanti, B. Hehlen, C. Levelut

           10. (O): "Competing order parameters in Zr-rich PZT perovskite at high pressure"
                    5^th European Workshop on Piezoelectric Materials, 16-18 July 2008, Montpellier, France
                    G. Fraysse, J. Rouquette, J. Haines, A. Alzein, V. Bornand, M. Pintard, Ph. Papet

               9. (O): "Low-symmetry phases in MPB systems (PZT, PZN-PT...) at low temperature and at high pressure"
               Workshop on MPB in ferroelectric ceramics, 6-8 March 2008, Darmstadt, Germany.
                     J. Haines, G. Fraysse, J. Rouquette, V. Bornand, M. Pintard, Ph. Papet

(P): "Dielectric and piezoelectric studies of lead-based relaxor ferroelectric single crystals under hydrostatic pressure"
Joint 21^st AIRAPT & 45^th EHPRG International Conference on High Pressure Science and Technology, 17-21 September 2007, Catania, Italy.
G. Fraysse, J. Haines, V. Bornand, J. Rouquette, M. Pintard, P. Papet, L. Lebrun, L. Konczewicz

(P): "P-T neutron diffraction studies of Pb(Zr_1-xTi_x)O₃ (PZT) system"
15^ème Journées de la Diffusion Neutronique, 10-16 May 2007, Maubuisson, France.
J. Rouquette, G. Fraysse, V. Bornand, M. Pintard, Ph. Papet, S. Hull and J. Haines

(P): "A revised phase diagram of Zr-rich PZT"
19^th Intenational Symposium on Integrated Ferroelectrics, 8-11 May 2007, Bordeaux, France.
G. Fraysse, V. Bornand, J. Haines, J. Rouquette, M. Pintard, Ph. Papet

(O): "Etudes multi-techniques et multi-échelles des pérovskites au plomb piézoélectriques sous pression"
5^ème Forum de Technologie des Hautes Pressions, 6-10 November 2006, Monthieux, France.
J. Haines, G. Fraysse, J. Rouquette, V. Bornand, M. Pintard, P. Papet

(O): "Structural phase transitions in lead perovskites at high pressure
7^th International Congress of the Solid State Chemistry, 24-29 September 2006, Pardubice, Czech Republic.
J. Haines, G. Fraysse, J. Rouquette, V. Bornand, M. Pintard, Ph. Papet

(P): "Low-symmetry structures in the Zr-rich side of the pressure-temperature-composition phase diagram of PbZr_(1-x)Ti_xO₃"
23^rd European Crystallographic Meeting, 6-11 August 2006, Leuven, Belgium.
G. Fraysse, J. Haines, V. Bornand, J. Rouquette, M. Pintard, P. Papet and S. Hull

(O): "In-situ high-pressure structure property relationships in perovskite-type ferroelectric materials"
1^st International Symposium on Structure-Property Relationships in Solid State Materials, 27-30 June 2006, Bordeaux, France.
G. Fraysse, V. Bornand, J. Haines, J. Rouquette, M. Pintard, P. Papet, L. Konczewicz, L. Lebrun

(P): "Gallium arsenate, a new material in the alpha-quartz family"
4^th European Workshop on Piezoelectric Materials, 21-23 July 2004, Montpellier, France.
G. Fraysse, O. Cambon, J. Haines, E. Philippot, B. Capelle, J. Détaint

Invited Talk

"Pressure-temperature-composition phase diagram of perovskite-type PbZr_(1-x)Ti_xO₃"
European Synchrotron Radiation Facility, Grenoble, 16-17 June 2008

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