X-ray diffraction study of the phase transition of K2Mn2(BeF4)3: a new type of low-temperature structure for langbeinites.
作者： A Guelylah , G Madariaga , V Petricek , T Breczewski , MI Aroyo
DOI: 10.1107/S0108768100019960
关键词: Langbeinite 、 Chemistry 、 Crystallography 、 Powder diffraction 、 X-ray crystallography 、 Crystal structure 、 Monoclinic crystal system 、 Tetrafluoroberyllate 、 Diffraction 、 Phase transition
摘要: The potassium manganese tetrafluoroberyllate langbeinite compound has been studied in the temperature range 100–300 K. Using DSC measurements, a phase transition detected at 213 K. space group of low-temperature was determined to be P1121 using X-ray diffraction experiments and optical observations domain structure. b axis is doubled with respect prototypic P213 cubic phase. Lattice parameters were by powder data [a = 10.0690 (8), 20.136 (2), c 10.0329 (4) A, γ 90.01 (1)°]. A precise analysis BeF4 tetrahedra shows that two independent rotate opposite directions along crystallographic axis. symmetry mode monoclinic distortion also reported. This first report existence such K2Mn2(BeF4)3 new type structure for compounds.
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