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Effects of high-temperature annealing on ESR properties of solid solutions of garnet minerals |
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| Institution: | 1. Instituto de Física, Universidade de São Paulo, Rua do Matão, Travessa R, 187, CEP 05508-090, São Paulo, SP, Brazil;2. Departamento de Engenharia Metalúrgica e Materiais, Escola Politécnica, Universidade de São Paulo, Av. Prof. Melo Moraes, 2463, CEP 05508900, São Paulo, SP, Brazil;3. Departamento de Ciências do Mar, Universidade Federal de São Paulo, Rua Doutor Carvalho de Mendonça, 144, CEP 11070-100, Santos, SP, Brazil;4. Escuela Profesional de Física, Facultad de Ciencias Naturales y Formales, Universidad Nacional de San Agustín (UNSA), Av. Independencia S/N, Arequipa, Peru |
| 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. |
| Keywords: | ESR TL Garnets High-temperature annealing |
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