Abstract
The mechanism of the α-β transition in K 2 ZnBr 4 is investigated by means of an X-ray structural study. The transition is a first-order one accompanied with a large amount of atomic displacements. The relation between the unit cell orientations of α and β phases can not be explained by an ordinal method applicable to the second order phase transition in orthorhombic Rb 2 ZnCl 4 -group crystals. In order to explain the α-β transition, intermediate body-centered cubic and hexagonal closed-packed structures are considered as virtual states between α and β phases. This virtual intermediate states (VIS) model gives us a good explanation for the change of the cell orientation and also for the large atomic displacements caused by the transition.
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