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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur

KFM 9: Focus: Polar oxide crystals and solid solutions

KFM 9.1: Vortrag

Mittwoch, 18. März 2020, 09:30–09:50, TOE 317

On the Growth of Lithium Niobate-Tantalate Solid Solution Single Crystals — •Steffen Ganschow¹, Detlef Klimm¹, Michael Rüsing², Benjamin Kirbus², Zeeshan Amber², and Lukas M. Eng² — ¹Leibniz-Institut für Kristallzüchtung, Max-Born-Straße 2, 12489 Berlin, Germany — ²Institut für Angewandte Physik, Technische Universität Dresden, Nöthnitzer Str. 61, 01187 Dresden, Germany

Lithium niobate (LiNbO₃, LN) and lithium tantalate (LiTaO₃, LT) belong to the most widely used ferroelectric materials, with applications that range from novel electronic and micro-mechanical devices to (integrated, nonlinear) optics. Recently, lithium niobate-tantalate solid-solution (LiTa_xNb_1−xO₃, LNT) single crystals have been demonstrated. LNT potentially might outperform pure LN and LT applications, since offering superior material properties such as the tailored birefringence combined with large temperature stability.

Crystallization of LNT solid solutions from the melt is characterized by a strong segregation leading to a pronounced macro-distribution of components and, occasionally, to cellular growth [1,2]. In this contribution here, we critically review previous attempts to manufacture LNT single crystals, and discuss novel approaches that promise LNT single crystals of enhanced chemical homogeneity. A phase diagram of the quasi-binary system based on a thermal analysis will be presented along with the results of our first crystal growth experiments.

[1] T. Fukuda and H. Hirano, J. Crystal Growth 33, 127 (1976).

[2] A. Bartasyte et al., Mater. Chem. Phys. 134, 728 (2012).