Meeting room "Glova", 4 floor, Integrated Research Building
Abstract
Measurements of the velocity of ultrasound waves in gases is very useful for studying their physical properties under high pressures. The elastic properties of materials under hydrostatic pressure have been studied by the measurement of elastic wave velocities. The elastic velocities in nano-polycrystalline diamond (cubic, cubic + hexagonal + graphite) were measured up to 0.1 GPa and to 500 ℃. Both the longitudinal and transverse elastic velocities of samples were obtained from analyzing the elastic wave signals by a pulse method and resonance method. Some cylindrical and sphere nano-polycrystalline diamonds velocities were measured. The bulk modulus, rigidity and Young's modulus are determined from the velocities. Pressure and temperature dependencies of velocities and elastic constants are derived.
For inquiry：Taku Tsuchiya TEL:（089）927-8198
E-mail takut@sci.ehime-u.ac.jp
