Structural Change of the Surroundings of K + in K 2 ZnBr 4 Crystal on the Monoclinic-Orthorhombic Phase Transition

Autor:	Hiroyuki Mashiyama, Hironobu Kasano, J. Sato
Rok vydání:	2002
Předmět:	Crystal Crystallography Phase transition Materials science Structural change Phase (matter) Beta phase Orthorhombic crystal system Crystal structure Condensed Matter Physics Electronic Optical and Magnetic Materials Monoclinic crystal system
Zdroj:	Ferroelectrics. 269:141-146
ISSN:	1563-5112 0015-0193
DOI:	10.1080/00150190211127
Popis:	In K 2 ZnBr 4 crystal, the monoclinic phase with the Sr 2 GeS 4 -type structure ( P 2 1 / m , Z =2) is transformed into the orthorhombic phase with the g -K 2 SO 4 -type structure ( Pmcn , Z =4) above 470K (an f - g transition). This f - g transition is known to be a reconstructive one. The crystal structure of the orthorhombic phase is refined in order to investigate in detail the structural change on the phase transition. It is found that the structure of the surroundings of one of two independent K + 's in the monoclinic phase is almost the same as the rotated structure of the surroundings of one of two independent K + 's in the orthorhombic one. We also discuss the difference between the crystal structures of K 2 ZnCl 4 (orthorhombic) and K 2 ZnI 4 (monoclinic) and the corresponding structures of K 2 ZnBr 4 .
Databáze:	OpenAIRE
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