Lattice parameters and thermal expansion coefficients of Al, Ag and Mo at low temperatures. Comparison with dilatometric data
Lattice parameters and thermal expansion coefficients of Al, Ag and Mo at low temperatures. Comparison with dilatometric data
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DOI：
10.1107/s0567739471001220
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发表时间：
1971-11
期刊：
影响因子：
--
通讯作者：
M. Straumanis;C. L. Woodward
中科院分区：
文献类型：
--
作者：
M. Straumanis;C. L. Woodward
在30 ~ 180°K温度范围内，用一种特殊的X射线照相机，在不使用液态气体的情况下，测定了Al、Ag和Mo的晶格参数和热膨胀系数。粉末样品通过机械制冷机冷却，并制备了三种金属的对称背反射图案。其目的是检查这种方法的可靠性，通过比较晶格参数和膨胀系数计算的X射线图案与其他建立良好的，干涉测量法得到的。的膨胀系数与合理的精度再现，但缺乏可靠的测量低温参数的文献中阻止了一个结论，从达到有关的晶格参数计算的准确性。给出了展开系数和晶格参数的值。
Lattice parameters and thermal expansion coefficients of Al, Ag and Mo were determined at temperatures between 30 and 180°K in a special X-ray camera without the use of liquid gases. The powder samples were cooled by a mechanical refrigerator, and symmetrical back-reflections patterns of the three metals were prepared. The purpose was to check the reliability of this method by comparing the lattice parameters and expansion coefficients calculated from X-ray patterns with those obtained by other well established, interferometric-dilatometric methods. The expansion coefficients were reproduced with reasonable precision, but the lack of reliable measurements of low-temperature parameters in the literature prevented a conclusion from being reached concerning the accuracy of the lattice parameters calculated. Values of the expansion coefficients and the lattice parameters are given.