An analysis of "best" LGS material constants based on BAW and SAW data

Since the first publication of material constants of langasite (LGS) and their temperature coefficients, a careful examination of the progression of reported values shows that they appear to be converging toward a "best" set of material constants. In this work, an "aggregate" set of the measured values of bulk wave velocities is used in order to provide a "best" set of measurement data for BAW propagation. A "best" set of material constants is extracted from this data, in conjunction with the aggregated dielectric constant and lattice constant data. This new set of material constants is able to predict wave velocities to better than 0.5% for most orientations.