J. Phys. IV France 04 (1994) C2-123-C2-134
Characterization of piezoelectric materials : old and new crystalsB. CAPELLE1, A. ZARKA1, J. SCHWARTZEL2, J. DETAINT2, E. PHILIPPOT3 and J.P. DENIS4
1 L.M.C.P., Universités Paris VI et Paris VII, CNRS, 4 Place Jussieu, 75252 Paris cedex, France
2 C.N.E.T., Laboratoire de Bagneux, 196 Av. H. Ravera, 92225 Bagneux, France
3 L.P.C.M.S., Université de Montpellier, case 03, 34095 Montpellier, France
4 Crismatec, 2 rue des Essarts, ZI des Mayencins, 38610 Gières, France
Some piezoelectric materials obtained by the hydrothermal growth method or by the Czochralsky growth method are studied. Their crystalline quality has been determined by X-ray topography using the synchrotron radiation at LURE (Orsay, France). In the case of the gallium phosphate the growth process with berlinite seeds has been studied by the section topography method. The use of berlinite seeds seems to be a good process to obtained rapidly large good seeds of gallium phosphate and therefore large crystals. Some results concerning the vibration modes and in some cases the interactions between the defects and the acoustic vibrations are presented.
© EDP Sciences 1994