Synchrotron powder-diffraction study of the spin transition compound [Fe(bpp)2](NCS)2•2H2O and soft X-ray-induced structural phase conversion

被引：7

作者：

Bhattacharjee, A. ^{[1
,2
]}

Kusz, J. ^{[3
]}

Zubko, M. ^{[3
]}

Goodwin, H. A. ^{[4
]}

Guetlich, P. ^{[1
]}

机构：

[1] Johannes Gutenberg Univ Mainz, Inst Anorgan Chem & Analyt Chem, D-6500 Mainz, Germany

[2] Visva Bharati Univ, Dept Phys, Santini Ketan 731235, W Bengal, India

[3] Silesian Univ, Inst Phys, PL-40007 Katowice, Poland

[4] Univ New S Wales, Sch Chem, Sydney, NSW, Australia

来源：

JOURNAL OF MOLECULAR STRUCTURE | 2008年 / 890卷 / 1-3期

基金：

澳大利亚研究理事会;

关键词：

Synchrotron diffraction; Iron (II); Spin transition; Soft X-ray-induced phase conversion;

D O I：

10.1016/j.molstruc.2008.05.033

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

We have studied the high spin and low spin structural phases of the two-step spin transition compound [Fe(bpp)(2)](NCS)(2)center dot 2H(2)O (bpp: 2,6-bis(pyrazol-3-yl)pyridine) of different sample history with X-ray synchrotron (lambda similar to 0.32 angstrom) powder diffraction at different temperatures as well as with usual X-ray (lambda similar to 1.54 angstrom) powder diffraction at room temperature by performing rapid repeated scans at regular intervals of time. A structural phase transition occurs only during the first step of the spin transition. Time dependent interconversions of the two crystallographic phases have been observed at room temperature for this material. The results indicate that a soft X-ray (Cu-K alpha)-induced structural change occurs in this material at room temperature. Possible mechanisms for this unusual observation are discussed. (c) 2008 Elsevier B.V. All rights reserved.

引用

页码：178 / 183

页数：6

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