Abstract
Recently extracted langatate (LGT) elastic, piezoelectric and dielectric constants up to 900°C were utilised to predict the temperature coefficient of frequency (TCF) of bulk acoustic wave (BAW) orientations. A range of LGT BAW orientations were identified with turnover temperatures between 100 and 550°C for use in high-temperature sensor and frequency control applications. In addition, the piezoelectric coupling of the identified orientations was investigated to determine the preferred cuts for high-temperature operation.
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