Structural change of the surroundings of K^+ in K_2ZnBr_4 crystal on the monoclinic-orthorhombic phase transition
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In K_2ZnBr_4 crystal, the monoclinic phase with the Sr_2GeS_4-type structure (P2_1/m, Z =2) is transformed into the orthorhombic phase with the β-K_2SO_4-type structure (Pmcn, Z =4) above 470K (an α-β transition). This α-β 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_2ZnCl_4 (orthorhombic) and K_2ZnI_4 (monoclinic) and the corresponding structures of K_2ZnBr_4 .
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Taylor and Francis | 論文
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