Title
Crystal field effect on EPR and optical absorption properties of natural green zoisite
Date Issued
01 March 2013
Access level
metadata only access
Resource Type
journal article
Author(s)
Publisher(s)
Elsevier
Abstract
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.
Start page
505
End page
511
Volume
104
Language
English
OCDE Knowledge area
Ingeniería eléctrica, Ingeniería electrónica
Ingeniería de materiales
Subjects
Scopus EID
2-s2.0-84871715642
PubMed ID
Source
Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy
ISSN of the container
13861425
Sponsor(s)
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.
Fundação de Amparo à Pesquisa do Estado de São Paulo FAPESP
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior CAPES
Sources of information:
Directorio de Producción Científica
Scopus