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Solid solutions Pr3(Ru1-xTax)O7 (0≤x≤1.0) and (Pr1-xYx)3RuO7 (0≤x≤0.7) were obtained as a single phase compound. They crystallize in an orthorhombic superstructure derived from that of the cubic fluorite with space group Cmcm. The results of the Rietveld analysis for X-ray diffraction profiles of Pr3(Ru1-xTax)O7 showed that Ru and Ta atoms are randomly situated at the six-coordinate 4b site. For (Pr...
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