Abstract
Abstract The crystal structures of (K x Na1-x )MnF3 have been determined by x-ray diffraction. KMnF3 and (K x Na1-x )MnF3 for 0.3 < x < 1.0 possess cubic symmetry, with the ionic configuration as in the ideal perovskite arrangement. With increase in the concentration of Na+ ions lattice distortion takes place. For x = 0.3 the cubic cell is distorted to tetragonal and for x < 0.3 a distortion to monoclinic symmetry is observed. The types of distortion, crystal systems and space groups of these compounds have been determined by the use of the scheme reported by Glazer (1972), where all the possible tilted octahedra in perovskite-type crystals have been classified.
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