Abstract Crystal structures and thermal expansion properties of Yb 2− x Fe x Mo 3 O 12 ( x = 0.0, 0.6, 1.0, 1.1, 1.4) solid solutions have been studied by… Click to show full abstract
Abstract Crystal structures and thermal expansion properties of Yb 2− x Fe x Mo 3 O 12 ( 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 Yb 2− x Fe x Mo 3 O 12 solid solutions adopt orthorhombic structure and have variable thermal expansion coefficients controlled by the ratio of Yb 3+ to Fe 3+ . Yb 2 Mo 3 O 12 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 Yb 3+ substituted by Fe 3+ , the linear thermal expansion coefficients of Yb 2− x Fe x Mo 3 O 12 increase from negative to positive. A near-zero thermal expansion coefficient of 0.55 × 10 −6 K −1 for Yb 0.6 Fe 1.4 Mo 3 O 12 is observed in the temperature range of 573–873 K
               
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