An optimized set of temperature coefficients for LGS

LGS is a promising material for SAW applications at high temperature. However, the temperature coefficients of LGS material constants are not accurate enough to perform reliable simulations above 300°C. In the first part of the paper, we describe a new possible way to derive these coefficients in a wider temperature range. The calculated coefficients allow for accurate predictions up to at least 800°C. In the second part, a deeper analysis of the algorithm outputs demonstrates some of its main limitations. Possible solutions are described to predict then improve the accuracy of the optimized coefficients values.