摘要
以水热法制备ZrW_2O_8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-ZrW_2O_8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ZrW_2O_8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。
ZrW2O8 powders were synthesized using hydrothermal route, and the property of negative thermal expansion was studied. The precursor of ZrW2 O8 was studied by thermogravimetric and differential scanning calorime- try （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 of α- 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.
基金
江苏省自然科学基金(BK20130523)
国家自然科学基金(51272093
51202093)
江苏大学科研启动基金(1283300001)
关键词
负热膨胀
ZRW2O8
纳米球
水热
negative thermal expansion, ZrW2O8, nano-spherical morphology, hydrothermal
