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With a Unicam 19 cm high-temperature powder camera, precision lattice parameters of hexagonal germanium dioxide have been determined at various temperatures in the range 36 to 516 °C by the X-ray method. From these data the coefficients of thermal expansion have been evaluated by a graphical method. The temperature dependence of the coefficients of thermal expansion, α|| and α, parallel and perpendicular to the principal axis respectively, are represented by the following equations:

\alpha _{\mid \mid} = 1.258 \times 10^{-6} + 1.359 \times 10^{-8}T - 1.032 \times 10^{-11} T^{2}{^\circ} {\rm C}^{-1}

\alpha _{\perp} = 10.558 \times 10^{-6} + 8.813 \times 10^{-9}T + 5.785 \times 10^{-12} T^{2}{^\circ} {\rm C}^{-1}

where T is the numerical value of the temperature expressed in °C. The thermal expansion of hexagonal GeO2 has been compared with that of the isomorphous α-quartz and the polymorphous tetragonal rutile-type GeO2.

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