Thermal expansion of crystals

Summary

The paper describes the results of study of the thermal expansion of barite and its directional dependence. The principal coefficients of linear expansion along the crystallographic axes are given by

$$\begin{gathered} \alpha _a = 0 \cdot 0_4 1362 + 0 \cdot 0_7 1298 t + 0 \cdot 0_{10} 1192 t^2 \hfill \\ \alpha _b = 0 \cdot 0_4 2395 + 0 \cdot 0_7 1256 t + 0 \cdot 0_{10} 1368 t^2 \hfill \\ \alpha _c = 0 \cdot 0_4 1407 + 0 \cdot 0_7 1520 t + 0 \cdot 0_{10} 1102 t^2 . \hfill \\ \end{gathered} $$

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