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

研究成果: Article査読

抄録

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.

本文言語English
論文番号936
ページ(範囲)1-9
ページ数9
ジャーナルCrystals
10
10
DOI
出版ステータスPublished - 2020 10

ASJC Scopus subject areas

  • 化学工学(全般)
  • 材料科学(全般)
  • 凝縮系物理学
  • 無機化学

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「Control of thermophysical properties of langasite-type La<sub>3</sub>Ta<sub>0.5</sub>Ga<sub>5.5</sub>O<sub>14</sub> crystals for pressure sensors」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。

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