Thermal Diffusivity and Phase Transition of Rare Earth Manganites

摘要

Thermal diffusivity of nonstoichiometric PrMnO{sub}3 and NdMnO{sub}3 phases were measured by laser flash method from room temperature to 1100 K, in addition to the data of electrical conductivity, thermal analysis and high temperature X-ray diffractometry to detect the phase transition. The thermal diffusivity curve varied with increasing temperature and showed a clear anomaly with a sudden dip at the phase transition temperature. The transition temperature decreases with oxygen nonstoichiometry in each phase.