Acoustic travel time gauges for in-situ determination of pressure and temperature in multi-anvil apparatus

摘要: In this study, we developed a new method for in-situ pressure determination in multi-anvil, high-pressure apparatus using an acoustic travel time approach within the framework of acoustoelasticity. The ultrasonic times polycrystalline Al2O3 were calibrated against NaCl scale up to 15 GPa and 900 °C Kawai-type double-stage multi-anvil conjunction with synchrotron X-radiation, thereby providing convenient reliable gauge at ambient high temperatures. pressures derived from are excellent agreement those fixed-point methods. Application offline experiment revealed remarkable densities coesite previous single crystal compression studies under hydrostatic conditions, thus strong validation current scale. not only can be used continuous pressur...