The surface acoustic wave properties of berlinite have been measured for the x-axis boule 92.75° cut. This cut was found to be temperature compensated at 32 °C. The velocity and coupling coefficient k2 were found to be 2747 m/sec and 0.003, respectively. The velocity and temperature coefficient of delay are in reasonable agreement with theory, while the value of k2 is lower than the theoretical value.
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Morency et al. (1978) studied this question.
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