论文部分内容阅读
用X射线衍射法测定了Pb-Sn-Cd三元系Pb基α相固溶体的点阵参数和摩尔体积。发现点阵参数随摩尔分数浓度呈线性变化,点阵畸变主要受组分的尺寸效应影响;摩尔体积对理想溶液行为呈正偏差,且Cd对超额摩尔体积的贡献远大于Sn。分别按Vegard定律和亚规则溶液模型对点阵参数和摩尔体积的数据与摩尔分数的关系进行数学回归,表明两解析式的预测精度均在实验误差范围内。
The lattice parameters and molar volume of Pb-Sn-Cd ternary Pb-based α-phase solid solution were determined by X-ray diffraction. It was found that the lattice parameter changes linearly with the molar concentration. The lattice distortion is mainly affected by the size effect of the component. The molar volume is positive deviation from the ideal solution, and the contribution of Cd to excess molar volume is much larger than that of Sn. According to Vegard’s law and sub-rule solution model respectively, the relationship between lattice parameter and molar volume data and molar fraction was mathematically regression, which showed that the prediction accuracy of the two analytic formulas were within the experimental error range.