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Exotic phases and strain in model perovskite under pressure.
P.Bouvier1*, M. Guennou2, J. Kreisel2
1
2
Institut Néel, CNRS/UJF UPR2940, 25 rue des Martyrs BP166, Grenoble, 38042 France
Materials Research and Technology Department, 41 rue du Brill, 4422 Belvaux, Luxembourg
*e-mail: [email protected]
Over the past 10 years, many efforts have been devoted to the (re-)examination of structural distortions in
perovskites under high-pressure in order to identify general rules for their evolutions and interactions with
reducing volume. I will present structural characterization of various model perovskites such as PbTiO3 [1,2],
SrTiO3[3,4] and the multiferroic BiFeO3[5,6]. Thought those example, I will show that the use of single crystal
x-ray diffraction and Raman spectroscopy allows precise determination of symmetry adapted strains and
order parameters and will discuss the appearance of either new kinds of large cells structures or the unusual
emergence of a polar phase at high pressure.
1. Ferroelectricity of perovskite under pressure, I.A.Kornev, L.Bellaiche, P.Bouvier, P.-E.Janolin,
B.Dkhil, J.Kreisel, Phys. Rev. Letters, 95 (2005) 196804/1-4.
2. High pressure effect on PbTiO3, P.-E.Janolin, P.Bouvier, J.Kreisel, I.A.Kornev, L.Bellaiche,
W.Crichton, M.Hanfland, B.Dkhil, Phys. Rev. Letters, 101 (2008) 237601/1-4.
3. Pressure-temperature phase diagram of SrTiO3 up to 53 GPa, M.Guennou, P.Bouvier, J.Kreisel,
D.Machon, Phys. Rev B 81, 054115 (2010).
4. High-pressure ferroelastic phase transition in SrTiO3, E.K.H.Salje, M.Guennou, P.Bouvier, M.A.
Carpenter, J.Kreisel, J.Phys. Cond. Matter. 23, 275901 (2011).
5. Effect of high pressure on the multiferroic BiFeO3, R. Haumont, P. Bouvier, A. Pashkin, K. Rabia, S.
Frank, B. Dhkil, W. A. Crichton, C. A. Kuntscher, J. Kreisel, Phys. Rev. B 79, 184110 (2009).
6. Multiple high-pressure phase transitions in BiFeO3, M.Guennou, P.Bouvier, G.S.Chen, B.Dkhil,
R.Haumont, G.Garbarino, J.Kreisel, Phys. Rev. B 84, 174107 (2011).
Pierre BOUVIER (UMR 5628, Grenoble)
Pierre BOUVIER
Institut Néel, CNRS/UJF UPR2940
25 rue des Martyrs BP166, Grenoble, 38042 France
Email : [email protected]
CV
Born in 1972. Master in Material Science at INP-Grenoble in 2000. Post-doc in 2001 at the European
Synchrotron Radiation Facility (ESRF Grenoble) on the id27 high-pressure beamline. Joined French
CNRS in 2002 to develop high-pressure studies on functional oxydes.
Interested in crystallographic aspects and in the detailed knowledge of atomic-scale structural change
(order parameters, strains) to understand the mechanism of phase transitions in solids. Mainly
interested in oxides such as ABO3 perovskites and multiferroics where competitions of different
instabilities (tilt, polar displacements, Jahn-Teller) are observed under high-pressure. Has skills in
Raman spectroscopy, X-ray diffraction on powder and single crystals using Synchrotron radiation,
High-hydrostatic pressure in Diamond anvil cells.
Publications
Pressure-induced suppression of the diffuse scattering in the model relaxor ferroelectric PMN.
B.Chaabane, J.Kreisel, B.Dkhil, P.Bouvier, Phys. Rev. Letters, 90 (2003) 257601/ 1-4.
Ferroelectricity of perovskite under pressure.
I.A.Kornev, L.Bellaiche, P.Bouvier, P.-E.Janolin, B.Dkhil, J.Kreisel,
Phys. Rev. Letters, 95 (2005) 196804/1-4.
High pressure effect on PbTiO3: An investigation by Raman and X-ray scattering up to 63 GPa.
P.-E.Janolin, P.Bouvier et al., Phys. Rev. Letters, 101 (2008) 237601/1-4.
Synthesis of new polymorphs of Hf3N4 by high pressure annealing of pre-structured precursor.
A.Salamat, A.L.Hector, B.M. Gray, S.A.J.Kimber, P.Bouvier, P.F.McMillan
J.Am.Chem.Soc.,135 (2013) 9503-9511.
Jahn-Teller, polarity and insulator-to-metal transition in BiMnO3 at high pressure.
M.Guennou, P.Bouvier, P.Toulemonde, C.Darie, C.Goujon, P.Bordet, M.Hanfland, J.Kreisel.
Phys. Rev. Letters, 112 (2014) 075501/1-5.