The Crystal Structure of KMnF<SUB>3</SUB> at 50 K

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  • The Crystal Structure of KMnF3 at 50K
  • Crystal Structure of KMnF3 at 50K

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The crystal structure of KMnF3 at 50 K has been determined and refined by least squares method. The crystals are tetragonal with space group P4⁄mbm and cell dimensions: at=5.894 and ct=8.348Å (Z=4). Intensity data were collected from Weissenberg photographs by using a microphotometer. Refinement on 122 superlattice reflections reached R=0.17. The structure is a slight distortion of the perovskite structure in which the tilting of MnF6 octahedra, around the [001]t axis, is observed only on the alternate (001)t planes. The structure is described in terms of successive condensation of the R25 and M3 soft phonon modes.

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