Elastic Constants and Thermal Expansion Coefficient of Hydrogenated Pd Alloys

抄録

Shear and Young’s modulus of hydrogenated Pd alloys have been measured as a function of temperature and hydrogen-concentration. From these measurements, the bulk-modulus was calculated in order to evaluate the harmonic term of lattice energy. The anharmonic term was also obtained from the measurement of thermal expansion. The value of harmonic term decreases with increasing hydrogen-concentration. The anharmonic term is slightly changed by hydrogenation. These behaviors were interpreted on the basis of the electron theory.