Abstract

A precision determination of the lattice parameters of zinc fluoride (ZnF2), manganous fluoride (MnF2) and cobaltous fluoride (CoF2) has been made in the temperature range 25 to 600° C., using a Unicam 19 cm. high temperature powder camera. From these data the coefficients of thermal expansion α| and α⊥ have been evaluated by a graphical method. For zinc and manganous fluorides, α| is greater than α⊥ as in the case of other crystals of rutile type of structure, whereas cobaltous fluoride is anomalous in its behaviour having a greater value for α⊥.

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