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中文摘要：
采用共沉淀法、分步固相法和溶胶凝胶法制备负热膨胀性ZrW2O8粉体。以XRD、SEM和TEM对产物结构及形貌进行表征，以原位X射线衍射分析粉体的负热膨胀特性。结果表明3种方法所制备的粉体均为单一立方结构的α-ZrW2O8相，共沉淀法制备的粉体颗粒较大，平均尺寸约为2．5μm×3．0μm，溶胶凝胶法制备的颗粒最小，平均尺寸达到100nm。所得粉体均表现为较强的负热膨胀特性，当粉体粒径相差不大时，负热膨胀系数变化很小，当颗粒粒径降低到纳米级时，负热膨胀系数有减小的趋势。
英文摘要：
Negative thermal expansion （NTE） ZrW2O8 powders were synthesized using co-precipitation, solid state reaction and Sol-Gel route. The structure and morphology of the resulting powders were characterized by XRD, SEM and TEM, respectively. In situ X-ray diffraction measurements was used to analysis NTE property. The resuits indicate that the samples are single phase of α-ZrW2O8. The powders prepared by co-precipitation were the biggest with an average dimension of 2.5 μm × 3.0 μm, the powders prepared by Sol-Gel route was the smallest with an average dimension of 100 nm. Powders had strong NTE property. The thermal expansion coefficient of ZrW2O8 was about the same when the particle size was in micrometer range and differed not too much. But when the particle size decreased to nanometer range, the thermal expansion coefficient was in a decreased trend with the particle size.
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