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Cooperative Tilting Scheme of VFi6 Octahedra Related to the Structural Phase Transitions of Diluted Layer Compound Cs0.5Rb0.5VF4 by M. Hidaka; H. Akiyama; A. Hidaka; B.M. Wanklyn is a Materials Science article available to read on EtoBox.

What is Cooperative Tilting Scheme of VFi6 Octahedra Related to the Structural Phase Transitions of Diluted Layer Compound Cs0.5Rb0.5VF4 about?

The successive structural phase transitions of the diluted layer compound Cs 0.5 Rb 0.5 VF 4 are studied by means of polarized light scattering and X-ray diffraction. It is found that the structural transitions occurring at about 123 and 368 K are mainly characterized by the cooperative tilting of VF 6 octahedra around [100], [010] and [001] axes in the two-dimensional networks of the octahedra. The space group in each phase is determined as follows; D 3 2 -P2 1 2 1 2 in Phase IV (T 123 K), D 13 2h -Pmmm in Phase III (123 K `T 368 K), and D 5 4h -P4/mbm in Phase II (368 K `T), on heating. The structure is determined at room temperature by using a four-circle X-ray diffractometer. The following tilting scheme of the VF 6 octahedra characterizes the structural phase transition of Cs 0.5 Rb 0.5 VF 4 ; a p b p c p (Phase IV) 3 a p a p c p (Phase III) 3 a 0 a 0 c p (Phase II) 3 a 0 b 0 c 0 (Phase I).

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Author

M. Hidaka; H. Akiyama; A. Hidaka; B.M. Wanklyn

Publisher

John Wiley and Sons; Wiley (John Wiley & Sons); John Wiley & Sons Ltd.; Wiley; Wiley - V C H Verlag GmbbH & Co. (ISSN 0031-8965)

Published

2000

Language

EN

Field

Materials Science (Physical Sciences)