|
|
Crystallization behavior, crystal structure and thermal expansion property of ZrW2-xMoxO8 |
School of Material Science and Engineering, Jiangsu University, Zhenjiang, Jiangsu 212013, China) |
|
|
Abstract ZrW2-xMoxO8 powders were synthesized by coprecipitation method using zirconium oxynitrate, ammonium tungstate and ammonium molybdate as raw materials. The effects of W/Mo ratio on the crystallization behavior, crystal structure and thermal expansion property of ZrW2-xMoxO8 were studied by differential scanning calorimetry (TG-DSC) and Powder X-ray diffraction (XRD). The results show that Mo substitution does not influence the negative thermal expansion property of the resulted ZrW2-x-MoxO8 which was synthesized either via the reaction of oxides raw materials (x<0.5) at transition of its corresponding trigonal and monoclinic phase (x≥0.5). The lattice constant at room temperature and the synthesis temperature decrease with the decreasing of W/Mo ratio. At high temperature, ZrW2-xMoxO8 adopting β-ZrW2O8 structure transforms to trigonal phase which does not possess NTE property.
|
|
|
|
|
|
|
|