A novel route to synthesize cubic ZrW2−xMoxO8 (x=0-1.3) solid solutions and their negative thermal expansion properties |
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Authors: | Ruiqi Zhao Huiliang Wang Hui Ma |
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Institution: | a College of Chemistry, Beijing Normal University, 100875, PR China b Analyzing and Testing Center, Beijing Normal University, 100875, PR China |
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Abstract: | Cubic ZrW2−xMoxO8 (c-ZrW2−xMoxO8) (x=0-1.3) solid solutions were prepared by a novel polymorphous precursor transition route. X-ray diffraction (XRD) analysis reveals that the solid solutions are single phase with α- and β-ZrW2O8 structure for 0?x?0.8 and 0.9?x?1.3, respectively. The optimum synthesis conditions of ZrWMoO8 are obtained from differential scanning calorimetry-thermal gravimetric analysis (DSC-TGA), XRD and mass loss-temperature/time curves. Following the above experience, the stoichiometric solid solutions of c-ZrW2−xMoxO8 (x=0-1) are obtained within 1 wt% of mass loss. The relationships of lattice parameters (a), phase transition temperatures (Tc) and instantaneous coefficients of thermal expansion (αi) against the content x of Mo are discussed based on the variation of order degree parameters of ZrW2−xMoxO8. |
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Keywords: | ZrW2&minus xMoxO8 Polymorphous precursor transition Synthesis Negative thermal expansion (NTE) |
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