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通过Ｘ射线衍射实验的方法测定了较高Ｗ含量的Ｔａ－Ｗ二元合金的晶格常数。用纯Ｔａ与合金的晶格常数之比再乘以按重量百分比计算的密度，求出合金的理论密度，并与按重量百分比计算的密度和实验测定的密度对比。分析３种实验方法计算的密度存在差异的原因，溶质元素Ｗ添加引起晶体结构产生“缩距”现象。结果表明：（１）Ｔａ－Ｗ合金随Ｗ含量的增加，晶格常数明显缩小，合金的密度升高；（２）Ｔａ－Ｗ合金按重量百分比计算的密度与实测的密度存在较大差异，而按晶格常数计算的理论密度与实测密度基本一致；（３）对于推算二元系无限连续固溶体的密度，根据合金的晶格常数计算的理论密度较为准确。
The lattice constants of Ta-W binary alloys with higher W content were determined by X-ray diffraction. The theoretical density of the alloy was calculated by multiplying the lattice constant of the pure Ta with the alloy by the density calculated by weight percentage and comparing with the density calculated by weight percentage and experimentally determined density. Analysis of the three experimental methods to calculate the density of the reasons for the difference, the addition of solute elements W cause the crystal structure to produce “shrinkage” phenomenon. The results show that: (1) the lattice constant of Ta-W alloy decreases with the increase of W content, and the density of the alloy increases; (2) There is a big difference between the density calculated by weight percentage and the measured density of Ta- While the theoretical density calculated by the lattice constant is basically consistent with the measured density. (3) The theoretical density calculated from the lattice constant of the alloy is more accurate for estimating the density of the infinite continuous solid solution of the binary system.