【摘要】 以水热法制备ZrW₂O₈粉体并研究其负热膨胀特性。对其前驱体进行热重-差热分析（TG-DSC）,以X射线粉末衍射（XRD）、扫描电子显微镜（SEM）对产物结构及形貌进行表征。结果表明所得粉体为单一α-ZrW₂O₈相,为纳米球颗粒,颗粒的平均直径约为30nm。变温X射线粉末衍射分析表明所得ZrW₂O₈粉体具有很好的负热膨胀特性,在室温到500℃时,平均热膨胀系数为-3.66×10-6℃-1。更多还原

【Abstract】 ZrW₂O₈powders were synthesized using hydrothermal route,and the property of negative thermal expansion was studied.The precursor of ZrW₂O₈ was studied by thermogravimetric and differential scanning calorimetry（TG-DSC）.The structure and morphology of the resulting powders were characterized by powder X-ray diffraction（XRD）and scanning electron microscopy（SEM）respectively.The results show that the sample is single phase ofα-ZrW₂O₈ with nano-spherical morphology,the average diameter is 30 nm.The high temperature X-ray diffraction measurement indicates that the material has strong negative thermal expansion.From room temperature to 500℃,the average thermal expansion coefficient is-3.66×10-6℃-1.更多还原