以柠檬酸为螯合剂，采用溶胶-凝胶法制备负热膨胀性 ZrW2 O 8粉体，对其前驱体进行热重-差热分析，以 X 射线粉末衍射、扫描电子显微镜对产物结构及形貌进行表征，结果表明所得粉体为单一α-ZrW2 O 8相，具有无规则形状.随着柠檬酸量的增加，颗粒有明显聚集长大的趋势，且形貌向片层状发展.变温X 射线粉末衍射分析表明，所得 ZrW2 O 8粉体具有很好的负热膨胀特性，在室温~500℃时，平均热膨胀系数为－6．14×10－6/℃.
Negative thermal expansion (NTE)material ZrW2 O 8 powders were synthesized by the sol-gel method with citric acid used as chelating agent.The precursor of ZrW2 O 8 was studied by thermogravimetric and differ-ential scanning calorimetry (TG-DSC).The structure and morphology of the resulting powders were character-ized by powder X-ray diffraction (XRD)and scanning electron microscopy (SEM)respectively.The results showed that the samples were single phase ofα-ZrW2 O 8 with irregular shape.With the increasing amount of cit-ric acid,the particles grew bigger with a slice layer shape.The High temperature X-ray diffraction measurement indicated that the material had strong NTE.From room temperature to 500 ℃,the average thermal expansion coefficient was -6.14×10 -6/℃.
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