Abstract
Crystal structures and thermal expansion properties of Yb2−xFexMo3O12 (x=0.0, 0.6, 1.0, 1.1, 1.4) solid solutions have been studied by X-ray powder diffraction (XRPD) at different temperatures. Rietveld analysis of the XRPD data shows that Yb2−xFexMo3O12 solid solutions adopt orthorhombic structure and have variable thermal expansion coefficients controlled by the ratio of Yb3+ to Fe3+. Yb2Mo3O12 shows anisotropic negative thermal expansion property, induced by the reductions in average Yb–O–Mo angle and average apparent Mo2–O bond length with increasing temperatures. As more Yb3+ substituted by Fe3+, the linear thermal expansion coefficients of Yb2−xFexMo3O12 increase from negative to positive. A near-zero thermal expansion coefficient of 0.55×10−6K−1 for Yb0.6Fe1.4Mo3O12 is observed in the temperature range of 573–873K
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