| Full text | |
| Author(s): |
Gonzales-Lorenzo, Carlos D.
[1]
;
Rao, T. K. Gundu
[1]
;
Cano, Nilo F.
[2]
;
Silva-Carrera, Betzabel N.
[3]
;
Rocca, Rene R.
[2]
;
Cuevas-Arizaca, Edy E.
[1]
;
Ayala-Arenas, Jorge S.
[4]
;
Watanabe, Shigueo
[1, 3]
Total Authors: 8
|
| Affiliation: | [1] Univ Sao Paulo, Inst Fis, Rua Matao, Travessa R 187, BR-05508090 Sao Paulo, SP - Brazil
[2] Univ Fed Sao Paulo, Inst Mar, Rua Doutor Carvalho de Mendonca 144, BR-11070100 Santos, SP - Brazil
[3] IPEN CNEN SP, Inst Pesquisas Energet & Nucl, Av Prof Lineu Prestes, 2242, Cidade Univ, BR-05508000 Sao Paulo, SP - Brazil
[4] Univ Nacl San Agustin Arequipa UNSA, Fac Ciencias Nat & Formales, Escuela Profes Fis, Av Independencia S-N, Arequipa - Peru
Total Affiliations: 4
|
| Document type: | Journal article |
| Source: | Journal of Luminescence; v. 217, JAN 2020. |
| Web of Science Citations: | 0 |
| Abstract | |
beta: CaSiO3 polycrystal was synthesized by the devitrification method. The polycrystal exhibits three thermoluminescence (TL) peaks at 124 degrees C, 250 degrees C and 306 degrees C. Electron paramagnetic resonance (EPR) spectroscopy was used to study the defect centers induced in the polycrystal by gamma irradiation and to identify the centers responsible for the TL process. Three defect centers contribute to the observed spectrum at room temperature. Center I with principal g-values 2.0135, 2.0094 and 2.0038 is attributed to O- ion and the center appears to be the recombination center for 124 degrees C, 147 degrees C and 306 C TL peaks. Center II exhibiting an isotropic g-value of 2.00025 is identified as an F+-center (singly ionized oxygen vacancy). F+-center is also observed to be a recombination center for several TL peaks. Center III is assigned to a Ti3+ center displaying an orthorhombic g-tensor with principal values g(1) = 1.9830, g(2) = 1.9741 and g(3) = 1.9046. This center is associated with 124 degrees C and 147 degrees C TL peaks. TL emission spectrum of beta-CaSiO3 shows two emission bands at 370 and 520 nm. (AU) | |
| FAPESP's process: | 14/03085-0 - Quaternary geochronology of Southeastern and Southern coast of Brazil |
| Grantee: | Shigueo Watanabe |
| Support Opportunities: | Research Projects - Thematic Grants |