Control of Thermophysical Properties of Langasite-Type La3Ta0.5Ga5.5O14 Crystals for Pressure Sensors
In: ISSN: 2073-4352 ; Crystals ; https://hal.archives-ouvertes.fr/hal-03011177 ; Crystals, MDPI, 2020, 10 (10), pp.936. ⟨10.3390/cryst10100936⟩, 2020
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Zugriff:
International audience ; We present a possible method to reduce the anisotropy of the thermal stress generated on langasite-type La 3 Ta 0.5 Ga 5.5 O 14 (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 La 3+ in LTG by a larger ion and considered Sr 2+ . 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.
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Control of Thermophysical Properties of Langasite-Type La3Ta0.5Ga5.5O14 Crystals for Pressure Sensors
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Autor/in / Beteiligte Person: | USUI, Haruki ; Tokuda, Makoto ; SUGIYAMA, Kazumasa ; Hoshina, Takuya ; Tsurumi, Takaaki ; Lebbou, Kheirreddine ; Yanase, Ikuo ; Takeda, Hiroaki ; School of Materials and Chemical Technology, Tokyo Institute of Technology, 226‐8502 Yokohama, Japan ; Institute for Materials Research, Tohoku University ; Tohoku University Sendai ; (LUMINESCENCE), Luminescence ; Institut Lumière Matière Villeurbanne (ILM) ; Université Claude Bernard Lyon 1 (UCBL) ; Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL) ; Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS) ; Graduate School of Science and Engineering, Saitama University, Saitama 338-8570, Japan |
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Zeitschrift: | ISSN: 2073-4352 ; Crystals ; https://hal.archives-ouvertes.fr/hal-03011177 ; Crystals, MDPI, 2020, 10 (10), pp.936. ⟨10.3390/cryst10100936⟩, 2020 |
Veröffentlichung: | HAL CCSD ; MDPI, 2020 |
Medientyp: | academicJournal |
DOI: | 10.3390/cryst10100936 |
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