Abstract
Abstract Non-stoichiometric Pr0.6Gd0.4O1.5+δ (δ=0.000, 0.075, 0.120, and 0.157), with a bixbyite structure, was investigated by X-ray diffraction. The intensities of the superlattice lines were found to decrease with an increase in δ. The structure analysis has revealed that metal ions gradually move to the ideal positions of the fluorite structure with an increase in δ and that excess oxygen ions preferentially occupy the Z-sites.
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