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中文摘要：
以溶胶凝胶法制备负热膨胀材料ZrW2O8粉体并与固相法制备的粉体相比较。对其前驱体进行热重-差热分析（TGDSC）、以X射线粉末衍射（XRD）、透射电镜（TEM）、扫描电子显微镜（SEM）分别对粉体进行物相分析和形貌观测。结果表明溶胶凝胶法比固相法合成温度低，于610℃合成单一立方结构ZrW2O8粉体，并且粉体颗粒比固相法小，为100nm；ZrW2O8粉体有很好的负热膨胀特性，以高温X射线衍射分析，在室温约500℃范围内，溶胶凝胶法制备的粉体的热膨胀系数为-5．93×10^-6／K；比固相法（-6．31×10^-6／K）的略低。
英文摘要：
Negative thermal expansion material ZrW2O9 powders were synthesized using Sol-Gel chemistry method,and compared with powders which were synthesized using solid state reaction. The precursor of ZrW2O9 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）, Transmission electron microscopy（TEM） and scanning electron microscopy （SEM）. The results showed that the temperature of the samples synthesized by sol-gel chemistry was lower than the powders prepared by solid state reaction,and the powders were single cubic phase of ZrW2O8 obtained at 610℃. The average dimension was smaller than powders synthesized by solid state reaction. The average size was 100nm. High temperature X-ray diffraction measurement indicated the powders had strong negative thermal expansion. The thermal expansion coefficient of ZrW2O8 synthe- sized by sol-gel chemistry was -5.93 × 10-6/K in the temperature range from room temperature to 500℃ ,and lower than which synthesized by solid state reaction（-6.31× 10^-6/K）.
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