Abstract
The thermal diffusivity of non-stoichiometric LaMnO 3+ x was measured by the laser flash method from room temperature to 800 K. Each curve of the thermal diffusivity for a near-stoichiometric specimen has a dip where there exists a phase transition from an orthorhombic to a rhombohedral structure. The transition temperature decreases with increasing oxygen non-stoichiometry and the degree of dipping becomes ambiguous. The thermal diffusivity decreases with increasing temperature below the transition temperature, but increases slightly with increasing temperature above the transition temperature. The heat capacity has a peak at the transition temperature. The thermal resistance of stoichiometric LaMnO 3 was calculated by a combination of thermal diffusivity and heat capacity data and analysed as consisting of a temperature-dependent and a temperature-independent term below the Debye temperature.
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