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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|
Dos Santos M.C.
|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.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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