Guowei ZHANG
,
Wenkang SHI
,
Xiaojun JI
,
Tao HAN
,
Feng DU
,
Lianger LI
材料科学技术（英文）
Langasite (LGS) is a novel piezoelectric crystal. The authors numerically analyses the temperature stability of surface acoustic waves (SAW) and the relation of SAW propagation with temperature on certain optimal cuts on LGS in this paper. The results show that LGS has better temperature stability than traditional piezo crystals. The results also demonstrate that the velocity of SAW decrease with temperature, the electro-mechanical coupling constant (k2) and temperature coefficient of frequency increases parabolically and the power flow angle increases linearly on certain optimal cuts of LGS. The calculation result compared with the experimental and show good agreement.
关键词:
La3Ga5SiO4(LGS)
,
null
,
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Xiaojun JI
,
Tao HAN
,
Wenkang SHI
,
Guowei ZHANG
材料科学技术（英文）
Surface acoustic wave (SAW) devices play a significant role in signal processing, frequency control and sensing applications. In general, they cannot operate at elevated temperature. The new crystal of langasite provides possibility for surface acoustic wave devices applied at high temperature. This paper studies the SAW properties of single and doubly rotated cuts of LGS at high temperature. The calculated SAW properties of LGS are analyzed in space with aid of contour plots, and two promising SAW orientation regions at high temperature are presented. For some typical cuts and propagating directions within the two optimal regions, their SAW characteristics vs temperatures are discussed. Based on the experimental evidence in some literatures, the reliability of calculated results is verified.
关键词:
High-temperature
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null
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null
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