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Open AccessArticle

Control of Thermophysical Properties of Langasite-Type La3Ta0.5Ga5.5O14 Crystals for Pressure Sensors

1
School of Materials and Chemical Technology, Tokyo Institute of Technology, Meguro, Tokyo 152-8552, Japan
2
Institute for Materials Research (IMR), Tohoku University, Sendai 980–8577, Japan
3
Institut Lumière Matière, UMR5306 CNRS, Universite de Lyon 1, 69622 Villeurbanne CEDEX, France
4
Graduate School of Science and Engineering, Saitama University, 255 Shimo-Okubo, Sakura-ku, Saitama 338-8570, Japan
*
Author to whom correspondence should be addressed.
Crystals 2020, 10(10), 936; https://doi.org/10.3390/cryst10100936
Received: 25 August 2020 / Revised: 12 October 2020 / Accepted: 13 October 2020 / Published: 14 October 2020
We present a possible method to reduce the anisotropy of the thermal stress generated on langasite-type La3Ta0.5Ga5.5O14 (LTG) piezoelectric crystals arising from the mismatch of the thermal expansion coefficients and Young’s moduli of the crystals and metals at high temperatures. To formulate this method, the thermal stresses of order-type langasite crystals, in which each cation site is occupied by one element only, were calculated and compared to each other. Our results suggest that the largest cation site affects the thermal stress. We attempted to replace La3+ in LTG by a larger ion and considered Sr2+. Single crystals of strontium-substituted LTG (Sr-LTG) were grown using the Czochralski method. The thermal stress along the crystallographic c-axis decreased but that perpendicular to the c-axis increased by strontium substitution into the LTG crystal. The anisotropic thermal stress was reduced effectively. The Sr-LTG single crystal is a superior candidate material for pressure sensors usable at high temperatures. View Full-Text
Keywords: anisotropy; thermal stress; langasite; pressure sensor; substitution anisotropy; thermal stress; langasite; pressure sensor; substitution
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MDPI and ACS Style

Usui, H.; Tokuda, M.; Sugiyama, K.; Hoshina, T.; Tsurumi, T.; Lebbou, K.; Yanase, I.; Takeda, H. Control of Thermophysical Properties of Langasite-Type La3Ta0.5Ga5.5O14 Crystals for Pressure Sensors. Crystals 2020, 10, 936.

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