Crystal Structure and Phase Transition of Some Metallic Halides (II)On the Phase Transition and the Crystal Structures of Cuprous Bromide

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The phase transition and the crystal structures of the three modifications in cuprous bromide (CuBr) were studied by the X-ray powder method and the calorimetric measurement. The crystal structures in γ, β and α phases were determined to be face centered cubic, hexagonal and body centered cubic respectively. In the γ-phase, the structure belongs to the zincblende type, but it shows an anomalous change with temperature. This anomalous change of the structure was investigated by the same method as applied to the recent study of γ-CuI, and it was found that this anomaly is analogous to that of γ-CuI. The structures of β and α-CuBr were ascertained to be both the average structures closely resembling to those of β and α-AgI respectively.