Abstract
Between room temperature and its melting point at 645°C, KNiCl 3 shows two structural phase transitions. The β→α transition at 287°C has a second-order character. The unit cell changes in size from a√3× a√3× c to a× a× c. A first-order-type phase transition, α→α′, takes place at 490°C. Structure determination of KNiCl 3, from powder neutron diffraction data taken at 350°C and 550°C, shows that the difference between the α and α′ phases is related to the total disorder of the K + ion in the α′ phase.
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