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A technique for determining thermal expansion coefficients in cubic, tetragonal, hexagonal, and orthorhombic crystals

机译:确定立方,四方,六方和正交晶体中的热膨胀系数的技术

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摘要

A set of measured thermal shifts {Delta theta(i)} of diffraction peaks is numerically processed by introducing special variables z(i), y(i), and x(i), and linear relations are obtained between the thermal shifts characterized by the values of z(i) as functions of the variables x(i) and y(i), which depend on the crystal-plane indices and the unit-cell parameters of the crystal. After the least-squares fit, these relations can be represented in a graphical form. The thermal expansion coefficients are determined directly from these plots or analytically.
机译:通过引入特殊变量z(i),y(i)和x(i)对衍射峰的一组测得的热位移{Delta theta(i)}进行数值处理,并获得具有以下特征的热位移之间的线性关系: z(i)的值是变量x(i)和y(i)的函数,这些变量取决于晶体的晶面指数和晶体的晶胞参数。最小二乘拟合之后,这些关系可以图形形式表示。热膨胀系数直接从这些图或通过解析确定。

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