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Instability and reactivity under pressure

OBJECTIVES
Understand structural Instabilities in ABO3 perovskite under pressure

COLLABORATIONS
  • ESRF, Grenoble (France) - Dr. M.Mezouar, Dr. G.Garbarino, Dr. W.Crichton
  • CRP Gabriel Lippmann, Belvaux (Luxemburg) - Prof. J. Kreisel, Dr. M. Guennou
  • Institut Néel, Grenoble (France) - Dr. P. Toutlemonde, Dr. P. Bordet,
  • Institut Lumière et Matière (France) - Dr. D.Machon
  • Univ. Of Cambridge (UK), Prof. E.K.Salje, Prof. M. Carpenter
  • Univ.College London, ( UK ) – Prof. P.McMillan

Contact

Projects

Crystal Growth Research Lines

Highlights

  • Precise determination of equation of state, phase transitions, order parameters and strains in several model perovskites up to 50 GPa.
  • New exotic structures in multiferroics BiFeO3 or BiMnO3.
  • Synthesis of new structures from nanometric precursors.
  • Metrology in diamond anvil cells

Illustration of a diamond anvil cell that squeezes a perovskite structure. Sketch of the principal distorsions examined under pressure and studied compounds.

Main Publications

M. Guennou, P. Bouvier, P. Toulemonde, C. Darie, C. Goujon, P. Bordet, M. Hanfland, J. Kreisel,
Jahn-Teller, polarity and insulator-to-metal transition in BiMnO3 at high pressure, Phys. Rev. Letters 112 (2014) 075501/1-5.

M. Guennou, P. Bouvier, G. S. Chen, B. Dkhil, R. Haumont, G. Garbarino, J. Kreisel
Multiple high-pressure phase transitions in BiFeO3,
Phys. Rev. B 84 (2011) 174107/1-10.

M. Guennou, P. Bouvier, B. Krikler, J. Kreisel, R. Haumont, G. Garbarino,
High-pressure investigation of CaTiO3 up to 60 GPa using x-ray diffraction and Raman spectroscopy, Phys. Rev. B 82 (2010) 134101/1-10.

M. Guennou, P. Bouvier, J. Kreisel, D. Machon
Pressure-temperature phase diagram of SrTiO3 up to 53 GPa,
Phys. Rev. B 81 (2010) 054115/1-10.

A. Salamat, A. L. Hector, B. M. Gray, P. Bouvier, P. F. McMillan,
Synthesis of tetragonal and orthorhombic polymorphs of Hf3N4 by high pressure annealing of pre-structured precursor, J. Am. Chem. Soc. 135 (2013) 9503-9511.

Date of update February 12, 2015

Univ. Grenoble Alpes