High-temperature langatate elastic constants and experimental validation up to 900°C

摘要: This paper reports on a set of langatate (LGT) elastic constants extracted from room temperature to 1100°C using resonant ultrasound spectroscopy techniques and an accompanying assessment these at high temperature. The evaluation the employed SAW device measurements 900°C along 6 different LGT wafer orientations. Langatate parallelepipeds wafers were aligned, cut, ground, polished, acoustic wave devices fabricated University Maine facilities specific orientations for constant extraction validation. delay lines prepared 100-nm platinum rhodium- zirconia electrodes capable withstanding temperatures up 1000°C. numerical predictions based high-temperature compared with phase velocity, fractional frequency variation, coefficients line response measurements. In particular, difference between measured predicted variation is less than 2% over 25°C range within calculated discrepancies. Multiple temperature-compensated verified in this paper: 4 had turnover (temperature coefficient = 0) 200 420°C, 2 below 100°C. summary, work 1100°C, confirmed validity those by 900°C, identified