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采用液相共沉淀法成功合成Y2(WO4)3,利用高、低温X射线衍射方法研究Y2(WO4)3的结构及其负热膨胀性能,发现液相共沉淀法制得的Y2(WO4)3与固相反应法制得的Y2(WO4)3具有一致的Pnca空间群正交结构和相差不大的晶胞参数和体积(经TOPAS软件计算),二者的本征体热膨胀系数分别为-18.8×10-6℃-1(液相法)和-19.5×10-6℃-1(固相法)。液相共沉淀法相对传统固相化学反应法,具有减少合成循环次数和降低反应温度的优点。这证明该法制备稀土钨酸盐类负膨胀材料是可行的。
Y2 (WO4) 3 was successfully synthesized by liquid coprecipitation. The structure and the negative thermal expansion of Y2 (WO4) 3 were investigated by high and low temperature X-ray diffraction. It was found that Y2 The solid phase reaction of Y2 (WO4) 3 has a consistent Pnca space group orthogonality and little difference between the unit cell parameters and volume (calculated by TOPAS software), the intrinsic body thermal expansion coefficient of the two were -18.8 × 10-6 ° C -1 (liquid phase method) and -19.5x10-6 ° C -1 (solid phase method). The liquid coprecipitation method has the advantages of reducing the number of synthesis cycles and lowering the reaction temperature compared with the traditional solid-phase chemical reaction method. This proves that the method of preparing rare earth tungstate negative expansion material is feasible.