Title
Effects of high-temperature annealing on ESR properties of solid solutions of garnet minerals
Date Issued
01 April 2016
Access level
metadata only access
Resource Type
journal article
Author(s)
Universidad Federal de Sao Paulo
Publisher(s)
Elsevier Ltd
Abstract
A garnet (G7) silicate mineral belonging to pyralspite subgroup was studied using the technique of electron spin resonance (ESR). This study shows that iron is present in G7 as isolated species as well as species coupled by dipolar interactions. The ESR data shows a gradual increase of cluster of Fe3+ ions accompanied by decrease of dipolar interactions and increase of possible exchange interactions at high temperature. The Fe2+→Fe3+ oxidation process occurs in the garnets as a function of annealing temperature. Thermoluminescence (TL) peaks at approximately 190 and 340 °C are observed in the irradiated G7 garnet. Investigations using the technique of ESR were carried out to identify the centers involved in the TL process.
Start page
158
End page
162
Volume
91
Language
English
OCDE Knowledge area
Minería, Procesamiento de minerales
Electroquímica
Subjects
Scopus EID
2-s2.0-84955240131
Source
Journal of Physics and Chemistry of Solids
ISSN of the container
00223697
Sponsor(s)
The authors wish to thank Ms. E. Somessari and Mr. C. Gaia, Instituto de Pesquisas Energeticas e Nucleares (IPEN), Brazil, for kindly carrying out the irradiation of the samples. To FAPESP (Process number 2014/03085-0) for partial financial support and to CAPES (Process number BEX-9612130) for fellowship to T.K. Gundu Rao.
Sources of information:
Directorio de Producción Científica
Scopus