Numéro
J. Phys. Colloques
Volume 42, Numéro C6, Décembre 1981
International Conference on Phonon Physics
Page(s) C6-424 - C6-426
DOI https://doi.org/10.1051/jphyscol:19816124
International Conference on Phonon Physics

J. Phys. Colloques 42 (1981) C6-424-C6-426

DOI: 10.1051/jphyscol:19816124

STUDY OF "PURE" KTaO3 AND KTN SINGLE CRYSTALS BY THERMAL CONDUCTIVITY MEASUREMENTS DOWN TO 50 mK

B. Salce1, A.M. De Goër1 et L.A. Boatner2

1  Service des Basses Températures, Laboratoire de Cryophysique, Centre d'Etudes Nucléaires de Grenoble, 85 X, 38041 Grenoble Cedex, France.
2  Sol. State Division, Oak Ridge National Laboratory, Post Office Box 10, Oak Ridge, Tennessee 37830, U.S.A.


Abstract
We have measured the thermal conductivity of pure and doped (Nb, Na, Li , Co, Ag, etc ...) KTaO3 single crystals to investigate the induced ferroelectric phase transition mechanisms. The strong phonon scattering observed in the "purest" KTaO3 is tentatively explained as well as the enhancement of this scattering by substituing Nb in the crystals. Results of preliminary numerical analysis of the curves are given.