Control of thermophysical properties of langasite-type La3Ta0.5Ga5.5O14 crystals for pressure sensors

Haruki Usui; Makoto Tokuda; Kazumasa Sugiyama; Takuya Hoshina; Takaaki Tsurumi; Kheirreddine Lebbou; Ikuo Yanase; Hiroaki Takeda

doi:10.3390/cryst10100936

Control of thermophysical properties of langasite-type La₃Ta_0.5Ga_5.5O₁₄ crystals for pressure sensors

Haruki Usui, Makoto Tokuda, Kazumasa Sugiyama, Takuya Hoshina, Takaaki Tsurumi, Kheirreddine Lebbou, Ikuo Yanase, Hiroaki Takeda

IMR - Materials Development Division

Research output: Contribution to journal › Article › peer-review

1 Citation (Scopus)

Abstract

We present a possible method to reduce the anisotropy of the thermal stress generated on langasite-type La₃Ta_0.5Ga_5.5O₁₄ (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.

Original language	English
Article number	936
Pages (from-to)	1-9
Number of pages	9
Journal	Crystals
Volume	10
Issue number	10
DOIs	https://doi.org/10.3390/cryst10100936
Publication status	Published - 2020 Oct

Keywords

Anisotropy
Langasite
Pressure sensor
Substitution
Thermal stress

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@article{0324794812d04989b08e241ceb69cf4e,

title = "Control of thermophysical properties of langasite-type La3Ta0.5Ga5.5O14 crystals for pressure sensors",

abstract = "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{\textquoteright}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.",

keywords = "Anisotropy, Langasite, Pressure sensor, Substitution, Thermal stress",

author = "Haruki Usui and Makoto Tokuda and Kazumasa Sugiyama and Takuya Hoshina and Takaaki Tsurumi and Kheirreddine Lebbou and Ikuo Yanase and Hiroaki Takeda",

note = "Funding Information: This research was funded by JSPS KAKENHI, grant number 19H02797. We would like to thank Kiyoshi Shimamura of NIMS, Japan, and Tomoaki Karaki of Toyama Pref. University, Japan and Katsumi Kawasaki of TDK Corp., Japan for providing crystal samples with CTGS (K.S.), CTAS (K.S.), CNGS (T.K.) and BTGS (K.K.), respectively. We are also grateful to Masaru Tada, Tokyo Institute of Technology, Japan for the technical support in the EPMA analysis. Publisher Copyright: {\textcopyright} 2020 by the authors.",

year = "2020",

month = oct,

doi = "10.3390/cryst10100936",

language = "English",

volume = "10",

pages = "1--9",

journal = "Crystals",

issn = "2073-4352",

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TY - JOUR

T1 - Control of thermophysical properties of langasite-type La3Ta0.5Ga5.5O14 crystals for pressure sensors

AU - Usui, Haruki

AU - Tokuda, Makoto

AU - Sugiyama, Kazumasa

AU - Hoshina, Takuya

AU - Tsurumi, Takaaki

AU - Lebbou, Kheirreddine

AU - Yanase, Ikuo

AU - Takeda, Hiroaki

N1 - Funding Information: This research was funded by JSPS KAKENHI, grant number 19H02797. We would like to thank Kiyoshi Shimamura of NIMS, Japan, and Tomoaki Karaki of Toyama Pref. University, Japan and Katsumi Kawasaki of TDK Corp., Japan for providing crystal samples with CTGS (K.S.), CTAS (K.S.), CNGS (T.K.) and BTGS (K.K.), respectively. We are also grateful to Masaru Tada, Tokyo Institute of Technology, Japan for the technical support in the EPMA analysis. Publisher Copyright: © 2020 by the authors.

PY - 2020/10

Y1 - 2020/10

N2 - 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.

AB - 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.

KW - Anisotropy

KW - Langasite

KW - Pressure sensor

KW - Substitution

KW - Thermal stress

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ER -

Control of thermophysical properties of langasite-type La₃Ta_0.5Ga_5.5O₁₄ crystals for pressure sensors

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Keywords

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