SKM 2023 – wissenschaftliches Programm
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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur
KFM 13: Polar Oxide Crystals and Solid Solutions I
KFM 13.5: Vortrag
Donnerstag, 30. März 2023, 11:35–11:55, POT 106
High-temperature stability of electrical and acoustic properties of congruent and near stoichiometric single crystalline LiNbO3, LiTaO3 and LiNb0.94Ta0.06O3 — •Yuriy Suhak1, Stepan Hurskyy1, Uliana Yakhnevych1, Fatima El Azzouzi1, Claudia Kofahl2, Harald Schmidt2, Steffen Ganschow3, Klaus-Dieter Becker4, and Holger Fritze1 — 1Institute for Energy Research and Physical Technologies, Clausthal University of Technology, Goslar, Germany — 2Institute of Metallurgy, Clausthal University of Technology, Clausthal-Zellerfeld, Germany — 3Leibniz Institut für Kristallzüchtung, Berlin, Germany. — 4Braunschweig University of Technology, Braunschweig, Germany
It is known that the intrinsic properties of LiNbO3, LiTaO3 and, consequently, of Li(Nb,Ta)O3 solid solutions are strongly dependent on lithium stoichiometry. In current work the electrical and acoustic properties of congruent and near-stoichiometric single crystalline Li(Nb,Ta)O3 are studied as a function of temperature by means of impedance spectroscopy and resonant piezoelectric spectroscopy, respectively. The preparation of near-stoichiometric samples was performed by vapor transport equilibration technique (VTE). It is shown, that VTE-treated samples generally exhibit lower conductivity and lower acoustic loss, which implies better thermal stability. The latter was examined by a long-term measurement of electrical conductivity at 500 °C in air. After about 330 hours of uninterrupted thermal treatment the conductivity of a congruent LiNb0.94Ta0.06O3 specimen was found to decrease only for about 3 %.