Ordering and Dynamic Properties with Respect to the Arrangement of Excess Oxygen Atoms in Layered Perovskite Oxide Crystals.
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概要
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Thermal properties of layered perovskite oxide crystals, Lan+1NinO3n+1+δ (n=1, 2) and La2CuO4+δ, found by using an adiabatic calorimeter are explained. The characters of the ordering in the arrangement of excess oxygen atoms and its relation to the tilt of BO6 (B; Ni, Cu) octahedra are discussed in combination with the results of neutron diffraction studies. The characters observed of glass transition phenomena are discussed with proposition of a relaxation time expression for the rearrangement motion of excess oxygen atoms. The correlation was found between freezing-in temperature of the rearrangement motion of excess oxygen atoms and the local structure around the excess oxygen atoms.
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