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Type: Artigo de periódico
Title: Theoretical And Experimental Investigation Of The Electron Spin Resonance 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: Electron spin-resonance experiments were performed on Co2+ substituting for Zn2+ or Mg2+ in powder samples of Zn2(OH)PO4 and Mg2(OH)AsO4. These two compounds are iso-structural and contain the Co2+ in two environments with approximately octahedral and trigonal bipyramidal structures. The observed resonances are described using a theoretical model that considers the departures from the two perfect structures. It is shown that resonance in the penta-coordinated complex is allowed, and the crystal fields that would reproduce the resonance of the Co2+ in the two environments are calculated. The low intensity of the resonance in the penta-coordinated complex is explained by assuming that this site 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.
Rights: fechado
Identifier DOI: 10.1088/0953-8984/14/8/329
Date Issue: 2002
Appears in Collections:Unicamp - Artigos e Outros Documentos

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