Measurements of Acoustical Physical Constants of La3Ta0.5Ga5.3Al0.2O14 Single Crystals at High Temperatures
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概要
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The dielectric, elastic, and piezoelectric constants of langasite family single-crystal La3Ta0.5Ga5.3Al0.2O14 (LTGA) were measured by combing plane-wave ultrasonic microspectroscopy (PW-UMS) technology with the resonance--antiresonance method in a range from room temperature to 1000 °C. The influence of dielectric loss at high temperatures on resonance and antiresonance frequencies was discussed. At room temperature, the piezoelectric constants d_{11} and d_{14} were 6.62 and -4.65 pC/N, respectively. d_{11} increased to 7.5 pC/N at 1000 °C. The electromechanical coupling factor k_{12} was about 16.8% in the entire temperature range. All the necessary parameters of the LTGA crystal for acoustic wave applications at high temperatures were determined in this research.
- 2012-09-25
著者
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Karaki Tomoaki
Department Of Eiectronics And Lnformatics Faculty Of Engineering Toyama Prefectutral Universtiy
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Kushibiki Jun-ichi
Faculty Of Engineering Tohoku University
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Adachi Masatoshi
Department Of Chemistry And Biotechnology Graduate School Of Engineering Tottori University
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Karaki Tomoaki
Department of Intelligent Systems Design Engineering, Faculty of Engineering, Toyama Prefectural University, Imizu, Toyama 939-0398, Japan
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Lv Tao
Department of Intelligent Systems Design Engineering, Faculty of Engineering, Toyama Prefectural University, Imizu, Toyama 939-0398, Japan
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Ohashi Yuji
Faculty of Engineering, Tohoku University, Sendai 980-8579, Japan
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Arakawa Mototaka
Faculty of Engineering, Tohoku University, Sendai 980-8579, Japan
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Kushibiki Jun-ichi
Faculty of Engineering, Tohoku University, Sendai 980-8579, Japan
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