Temperature-dependent Young's modulus, shear modulus and Poisson's ratio of p-type Ce0.9Fe3.5Co0.5Sb12 and n-type Co0.95Pd0.05Te0.05Sb3 skutterudite thermoelectric materials

摘要: Effective models of the mechanical behavior thermoelectric materials under device conditions require knowledge temperature-dependent elastic properties. Between room temperature and 600 K, resonant ultrasound spectroscopy measurements three skutterudite materials, i.e. n-type Co0.95Pd0.05Te0.05Sb3 (both with without 0.1 at.% cerium dopant) p-type Ce0.9Fe3.5Co0.5Sb12, showed that Young's shear moduli decreased linearly at a rate −0.021 GPa/K to −0.032 GPa/K, −0.011 GPa/K −0.013 GPa/K, respectively. In contrast, Poisson's ratio was approximately 0.22 for relatively insensitive temperature. For temperatures >600 K, more rapidly resonance peaks broadened, indicating onset viscoelastic behavior. The relaxation least Ce-doped material, which grain boundary precipitates may inhibit sliding in turn has impor...