以硝酸氧锆、钼酸铵和钨酸铵为原料, 采用水热方法合成了立方相ZrW1.7Mo0.3O8粉体. 分别采用X射线粉末衍射(XRD)、热重-差热分析(TG-DSC)、傅立叶红外光谱(FT-IR)、扫描电镜(SEM)分析测试手段研究了前驱体的晶化过程、产物的结晶度和表面形貌. 结果表明, 采用水热法在550～650℃热处理都能合成出结晶度良好的立方相ZrW1.7Mo0.3O8, 其粒径分布较为均匀, 本征热膨胀系数和宏观热膨胀系数分别为-6.61×10-6K-1和 --5.76×10-6K-1
The negative thermal expansion material cubic phase ZrW1.7Mo0.3O8 powder was synthesized by using zirconium oxynitric, ammonium tungstate and ammonium molydbate as raw materials. X-ray powder diffraction (XRD), thermogravimetric analysis (TG-DSC), Fourier transform infrared spectroscopy (FT-IR), scanning electron
micrograph (SEM) were used to study the crytallization process of the precursor, crystallinity and crystal morphology of the resulted product.
The results show that pure cubic ZrW1.7Mo0.3O8 are prepared, and the particle size distribution is relatively uniform. In the temperature range from ambient temperature to 700℃, the intrinsic and macro thermal expansion coefficients of cubic ZrW1.7Mo0.3O8 are -6.61×10-6K-1 and -5.76×10-6K-1, respectively.
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