Pb-Sn-Cd三元系Pb基α相固溶体点阵参数、摩尔体积、超额摩尔体积的研究  

Studies on Lattice Parameter,Molar Volume and Excess Molar Volume of Pb-Based a-Phase Solid Solution in Pb-Sn-Cd Ternary System

作　　者：刘恒利[1] 龙骧[2] 高忠民[2] 赵慕愚[3] 

机构地区：[1]长春地质学院岩化系 [2]吉林大学测试中心 [3]吉林大学化学系,130023

出　　处：《高等学校化学学报》1990年第12期1405-1409,共5页Chemical Journal of Chinese Universities

摘　　要：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 a and the molar volumes Vm of Pb-based a-phase solid solution in the Pb-Sn-Cd ternary system were determined by means of X-ray diffraction. The lattice parameters a vary linearly with the molar fractions, the lattice distortion is mainly affected by the size effect of components. The molar volumes show a positive deviation from the behavior of the ideal solution, and the contribution of the solute Cd to excess molar volumes VE is much larger than that of the solute Sn. According to Vegard's law-or sub-regular solution model, the relationship between a or Vm and the compositions of alloy is obtained by the mathematic regressive method, the prediction precisions of both the formulae are within the limits of experiment error.

关 键 词：铅-锡-镉 合金固溶体 热力学行为 

分 类 号：TG146.12[一般工业技术—材料科学与工程]