J. Phys. IV France
Volume 126, June 2005
Page(s) 43 - 46

J. Phys. IV France 126 (2005) 43-46

DOI: 10.1051/jp4:2005126009

Structural and mechanical stability of La$_{\bf 3}$Ga $_{\bf 5.5}$Ta$_{\bf0.5}$O$_{\bf 14}$ single crystal under hydrostatic pressure

C. Hubert1, M. Gauthier1, F. Decremps1, G. Syfosse1, A. Polian1, 2, J.P. Itié1, 2, P. Munsch2, E. Bigler3 and J.J. Boy3

1  Physique des Milieux Condensés, CNRS UMR 7602, Université Pierre et Marie Curie, Campus Boucicaut, 140 rue de Lourmel, 75015 Paris, France
2  Laboratoire pour l'Utilisation du Rayonnement Électromagnétique, CNRS UMR 130, Centre Universitaire Paris Sud, BP. 34, 91898 Orsay Cedex, France
3  Laboratoire de Chronométrie Électronique et Piézoélectricité, ENSMM, 26 chemin de l'Épitaphe, 25000 Besançon, France

The high pressure structural and elastic behaviour of LGT single crystal has been explored. The phase diagram has been investigated up to 20 GPa by x-ray diffraction and the equation of state deduced. The complete set of second order elastic constants (S.O.E.C.) and their pressure dependence have been determined by bulk acoustic wave measurements up to 8 GPa. The bulk and linear moduli and their pressure variations have been calculated and compared to values obtained by x-ray diffraction. The stability Born criteria have been deduced.

© EDP Sciences 2005