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Type: Artigo de periódico
Title: Heat-induced charge transfer in cobalt iron cyanide
Author: Martinez-Garcia, R
Knobel, M
Goya, GF
Gimenez, MC
Romero, FM
Reguera, E
Abstract: The heating of Co(2+) ferricyanide above 80 degrees C induces an inner charge transfer from Co(2+) towards Fe(III) to form the mixed valence system Co(2+)Co(III) ferri- ferro-cyanide. This charge transfer takes place preserving the material framework and forming a solid solution of the initial and final species. The cell edge of the cubic cell (Fm-3m) of this solid solution follows a regular variation with the material composition. This mixed valence system was characterized using X-ray diffraction, infrared, thermo-gravimetric, Mossbauer and magnetic measurements. Its formation is easily detected by the appearance of an intermediate v(CN) absorption band in the infrared spectra at around 2120cm(-1), 40cm(-1) below and above the observed frequency for this vibration in Co(2+) ferri- and ferro-cyanide, respectively. (c) 2006 Elsevier Ltd. All rights reserved.
Subject: inorganic compounds
infrared spectroscopy
Mossbauer spectroscopy
X-ray diffraction
crystal structure
Country: Inglaterra
Editor: Pergamon-elsevier Science Ltd
Citation: Journal Of Physics And Chemistry Of Solids. Pergamon-elsevier Science Ltd, v. 67, n. 11, n. 2289, n. 2299, 2006.
Rights: fechado
Identifier DOI: 10.1016/j.jpcs.2006.05.045
Date Issue: 2006
Appears in Collections:Unicamp - Artigos e Outros Documentos

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