Dresden 2020 – scientific programme

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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur

KFM 9: Focus: Polar oxide crystals and solid solutions

KFM 9.2: Talk

Wednesday, March 18, 2020, 09:50–10:10, TOE 317

Poling of lithium niobate tantalate mixed crystals: Lessons learned from lithium niobate and tantalate — •Lukas M. Eng¹, Steffen Ganschow², Henrik Beccard¹, Ekta Singh¹, Zeeshan Amber¹, Benjamin Kirbus¹, and Michael Rüsing¹ — ¹Institut für Angewandte Physik, Technische Universität Dresden, Nöthnitzer Str. 61, 01187 Dresden, Germany — ²Leibniz-Institut für Kristallzüchtung, Max-Born-Straße 2, 12489 Berlin, Germany

The ability to structure ferroelectric domains is the key ability for the functionalization of ferroelectric materials leading to their broad palette of applications, ranging from novel electronics, micro-mechanical devices, to (integrated, nonlinear) optics. Lithium niobate (LiNbO₃, LN) and lithium tantalate (LiTaO₃, LT) belong to the most widespread used materials for these applications. Recently, lithium niobate-tantalate (LiTa_xNb_(1−x)O₃, LNT) mixed crystals have been fabricated, that potentially promise advantages over the boundaries of bare LN or LT, such as an improved temperature stability, or the tailoring of material properties such as the birefringence. Furthermore, LNT presents a model system for testing the impact and relevance of several effects (doping, poling, temperature, etc.) on their technological performance. In this work we discuss and analyze the poling of the model systems LN and LT and present first observations of domains in this mixed crystal system. The fabrication and analysis of poled domains in the model system LNT presents a key step towards realizing novel devices for a broader range of applications.