The Crystal Structure of KMnF_3 at 50 K
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概要
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The crystal structure of KMnF_3 at 50 K has been determined and refined by least squares method. The crystals are tetragonal with space group P4/mbm and cell dimensions: a_t=5.894 and c_t=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 MnF_6 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 R_<25> and M_3 soft phonon modes.
- 社団法人日本物理学会の論文
- 1975-07-15
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