NDLI: Control of Thermophysical Properties of Langasite-Type $La_{3}Ta_{0.5}Ga_{5.5}O_{14}$ Crystals for Pressure Sensors

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Control of Thermophysical Properties of Langasite-Type $La_{3}Ta_{0.5}Ga_{5.5}O_{14}$ Crystals for Pressure Sensors

Content Provider	MDPI
Author	Usui, Haruki Tokuda, Makoto Sugiyama, Kazumasa Hoshina, Takuya Tsurumi, Takaaki Lebbou, Kheirreddine Yanase, Ikuo Takeda, Hiroaki
Copyright Year	2020
Description	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.
Starting Page	936
e-ISSN	20734352
DOI	10.3390/cryst10100936
Journal	Crystals
Issue Number	10
Volume Number	10
Language	English
Publisher	MDPI
Publisher Date	2020-10-14
Access Restriction	Open
Subject Keyword	Crystals Anisotropy Thermal Stress Langasite Pressure Sensor Substitution
Content Type	Text
Resource Type	Article

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