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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Effects of high-temperature annealing on ESR properties of solid solutions of garnet minerals

Texto completo
Autor(es):
Rao, T. K. Gundu [1] ; Cano, Nib F. [2] ; Chubaci, Jose F. D. [1] ; Watanabe, S. [1]
Número total de Autores: 4
Afiliação do(s) autor(es):
[1] Univ Sao Paulo, Inst Fis, Rua Matao, Travessa R 187, BR-05508090 Sao Paulo, SP - Brazil
[2] Univ Fed Sao Paulo, Dept Ciencias Mar, Santos, SP - Brazil
Número total de Afiliações: 2
Tipo de documento: Artigo Científico
Fonte: JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS; v. 91, p. 158-162, APR 2016.
Citações Web of Science: 1
Resumo

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 (11) peaks at approximately 190 and 340 degrees 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. (C) 2016 Elsevier Ltd. All rights reserved. (AU)

Processo FAPESP: 14/03085-0 - Geocronologia do quaternário da costa Sudeste e Sul do Brasil
Beneficiário:Shigueo Watanabe
Linha de fomento: Auxílio à Pesquisa - Temático