Thermoluminescence and defect centers in synthetic diopside

Autor(es)

Cano, Nilo F. ^[1] ; Rao, T. K. Gundu ^[2] ; Gonzales-Lorenzo, Carlos D. B. ^[2] ; Ayala-Arenas, Jorge S. ^[3] ; Javier-Ccallata, Henry S. ^[4] ; Watanabe, Shigueo ^[2]

Afiliação do(s) autor(es)

^[1] Univ Fed Sao Paulo, Inst Mar, Rua Doutor Carvalho Mendonca 144, BR-11070100 Santos, SP - Brazil

^[2] Univ Sao Paulo, Inst Fis, Rua Matao, Travessa R 187, BR-05508090 Sao Paulo, SP - Brazil

^[3] Univ Nacl San Agustin, Escuela Profes Falai, Fac Ciencias Nat & Formates, Av Independencia S-N, Arequipa - Peru

^[4] Univ Tecnol Peru, Fac Ciencias & Ingn, Av Tacna & Arica 160, Arequipa - Peru

• Tipo de documento: Artigo Científico
• Fonte: Journal of Luminescence; v. 211, p. 314-319, JUL 2019.
• Citações Web of Science: 1

Resumo

MgCaSi2O6 polycrystal was synthesized by the devitrification method. The dosimetric characteristics by TL of this prepared polycrystal was investigated. This material exhibits TL peaks at 115, 160, 210, 260 and 280 degrees C. The dosimetric peak occurs at 260 degrees C with a well defined glow curve structure. This peak shows a linear dose response. Electron paramagnetic resonance (EPR) studies have been carried out to identify the defect centers responsible for the TL peaks. Two defect centers in the region of g = 2.0 are found. One of the centers (center I) with a g factor equal to 2.0085 is identified as O--ion and relates with the observed high temperature 250 and 300 degrees C TL peaks. Additional defect centers with g = 2.0012 (center II) and 1.982 (center III) are due to F+-centers (electron trapped at an oxygen vacancy). Center II and III correlate with the TL peaks at 160 degrees C and 106 degrees C, respectively. (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