Crystal field effect on EPR and optical absorption properties of natural green zoisite

Henry Javier-Ccallata, Shigueo Watanabe

Resultado de la investigación: Contribución a una revistaArtículorevisión exhaustiva

Resumen

In this study the electron paramagnetic resonance (EPR) and optical absorption (OA) of natural crystal of zoisite were investigated after γ (60Co) irradiation and high temperature annealing. EPR measurements show that the zoisite from Tefilo Otoni MG Brazil contain Cr3+, Fe3+ and Mn2+ ions and occupy distorted Al3+ octahedral and tetrahedral sites which are subjected to the action of a strong crystal field in axial direction. Absorption bands which in principle give rise to sets of EPR lines between 500 and 2500 G were found using the deconvolution method. The application of high doses of gamma ray and high temperature annealing has shown no significant effects on EPR and OA spectra. Spin-allowed, spin-forbidden and crystal field parameters were calculated for 3d3 configuration and interpreted using the spin Hamiltonian formalism containing axial and rhombic terms in low symmetries.

Idioma originalInglés
Páginas (desde-hasta)505-511
Número de páginas7
PublicaciónSpectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy
Volumen104
DOI
EstadoPublicada - mar. 2013
Publicado de forma externa

Nota bibliográfica

Funding Information:
We would like to thank Ms. E. Somesari and Mr. C. Gaia for kindly carrying out irradiation of the samples. This work was supported by CAPES and FAPESP.

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