Theory and experiment of the ESR of Co2+ in Zn2 % (OH)PO4 and Mg2(OH)AsO4
M. E. Foglio, M. C dos Santos, G. E. Barberis, J. M. Rojo, J. L. Mesa, L. Lezama, T. Rojo
Abstract
Experiments of Electron Spin Resonance (ESR) were performed on Co% 2+ substituting Zn2+ or Mg2+ in powder samples of Zn2(OH)PO4 and Mg2(OH)AsO4. 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 crystal fields that would describe the resonance of the Co2+ in the two environments are calculated. The small intensity of the resonance in the penta-coordinated complex is explained 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.
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