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Type: Artigo de periódico
Title: Theory And Experiment Of The Esr Of Co2+ In Zn2(oh)po4 And Mg2(oh)aso4
Author: Foglio M.E.
Dos Santos M.C.
Barberis G.E.
Rojo J.M.
Mesa J.L.
Lezama L.
Rojo T.
Abstract: Powder samples of Zn2(OH)PO4 and Mg2(OH)AsO4 were prepared with Co2+ substituting Zn2+ and Mg2+, respectively. These compounds are iso-structural, and both contain the Co2+ in two environments of approximately octahedral and trigonal bipyramid structures. Experiments of electron spin resonance were performed on these two compounds, and the observed resonances are described with a theoretical model that considers the departures from the two perfect structures. It is shown that the resonance in the penta-coordinated complex is allowed, and the small intensity observed for this complex is explained assuming that it is much less populated than the octahedral one. This assumption was verified by a molecular calculation of the energies of the two environments, with both Co and Zn as central ions in Zn2(OH)PO4. © 2002 Elsevier Science B.V. All rights reserved.
Rights: fechado
Identifier DOI: 10.1016/S0921-4526(02)00765-2
Date Issue: 2002
Appears in Collections:Unicamp - Artigos e Outros Documentos

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