Double oxides were investigated in the system of Pr-Mo-O. One of the raw materials was Pr2O3 powder. The other one, MoO3 powder was used following heat-treatment in dry air at 673 K for 2.4 ks. The X-ray diffraction measurements for the samples were then carried out using a diffractometer with Cu Kα radiation. Double oxides of 8 mole ratios were formed by a solid phase reaction between Pr2O3 and MoO3. The study also confirmed the existence of the double oxides in the system of Pr-Mo-O.
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