High-pressure ultrasonic setup using the Paris–Edinburgh press: Elastic properties of single crystalline germanium up to 6 GPa

A setup for the measurement of ultrasonic properties of single crystals at high pressure in the 10 GPa range is presented. In order to validate this new device, based on the “Paris–Edinburgh” press, the elastic properties of germanium have been measured and compared with the published data. The transit times of the ultrasonic waves are directly measured. The three elastic moduli and their pressure derivatives are obtained up to 6 GPa through three different methods of calculation, which are presented and compared. These results are in good agreement with previous results and hence validate the device. The Paris–Edinburgh press enables in situ measurement of ultrasonic and x-ray diffraction on the studied sample.