Abstract
The temperature coefficients of the effective elastic coefficients of Langatate (LGT) are determine in the range [4K, 15K]. The theoretical background is based on the Lagrangian formalism which is here mandatory since the expansion coefficients of LGT are still unknown at these temperatures. The measurement method involves a set of high-quality resonators of various cut angles, and uses the frequency-temperature records to extract the temperature coefficients of the elastic coefficients from those of the resonance frequencies.
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