复合氧化物Dy_(10)W_2O_(21)的热学性质研究

Thermal Properties in Complex Oxide Dy_(10) W_2O_(21)

采用高温固相反应法合成了单相的稀土复合氧化物Dy1 0 W2 O2 1 。用热膨胀仪测定了其表观热膨胀系数。采用变温X射线衍射方法测定不同温度衍射谱 ,TREOR程序进行了指标化 ,确定为立方晶系 ,计算了单胞常数和本征热膨胀系数。用热分析仪测定了样品的DSC曲线 ,表明没有相变发生。

Tungstate Dy 10 W 2O 21 was synthesized with solid state reaction method at high temperature. The phase structure was determined by X ray powder diffraction technique, and indexed in cubic system. The crystal structure was identified by high temperature X ray powder diffraction in the range of 25～1000 ℃, and the intrinsic thermal expansion coefficient was accurately calculated. Thermal expansion was also determined by a Netzsch dilatometery .DSC experiments present that the complex oxide is thermodynamically stable in the range of room temperature to 1000 ℃.