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共沉淀法制備負膨脹系數材料ZrW2O8

Synthesis of negative thermal expansion material ZrW2O8 through co-precipitation method

  • 摘要: 以H2WO4和ZrOCl2·8H2O為原料,先采用共沉淀法制備出前驅物,再加熱合成出了ZrW2O8粉末.用X射線衍射(XRD)對合成粉末進行物相分析,用掃描電子顯微鏡(SEM)分析粉末形貌,用差熱-熱重分析確定合成溫度.結果表明:溶液pH值控制在2~3范圍內,溶液中Zr4+和WO42-能同時發生沉淀;所得前驅物在1200℃反應1h,所得產物相主要為ZrW2O8,其粒度在100nm左右,且分布均勻.

     

    Abstract: ZrW2O8 was economically synthesized from ZrOCl2·8H2O and H2WO4 through co-precipitation route. The phases of the synthesized powders were analyzed by X-ray diffraction (XRD), the morphology was observed by scanning electron microscopy (SEM), and the synthesized temperature was determined by differential thermal gravimetric analysis. The result reveals that the suitable pH value of co-precipitation of Zr4+ and WO42- was 2-3. After the precursor was heated at 1200℃ for 1 h, the main phase of the synthesized powders was ZrW2O8. The particle size of ZrW2O8 powders wad about 100 nm and distributed homogeneously.

     

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