Thermoluminescent composites of sintered synthetic-topaz/in situ corundum for dosimetry by a novel reversible process
Topaz (Al2F1·44(OH)0·56SiO4)/corundum (Al2O3) composites were prepared by a facile and novel reversible process from the sintering of synthetic topaz and AlF3 powders, with corundum formed in situ into the topaz matrix. The corundum formation reaction occurs in the temperature range 875–975 °C, from...
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| Format: | Article |
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Elsevier
2024-02-01
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| Series: | Heliyon |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2405844024010569 |
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| author | S.A. Sinclair M.I. Pech-Canul M.C. Acosta-Enríquez R. Meléndrez Amavizca Alejandro Sala Crist J. Marcazzó |
| author_facet | S.A. Sinclair M.I. Pech-Canul M.C. Acosta-Enríquez R. Meléndrez Amavizca Alejandro Sala Crist J. Marcazzó |
| author_sort | S.A. Sinclair |
| collection | DOAJ |
| description | Topaz (Al2F1·44(OH)0·56SiO4)/corundum (Al2O3) composites were prepared by a facile and novel reversible process from the sintering of synthetic topaz and AlF3 powders, with corundum formed in situ into the topaz matrix. The corundum formation reaction occurs in the temperature range 875–975 °C, from 40 min sintering time, obtaining the topaz- Al2F1·44(OH)0·56SiO4/corundum- Al2O3 composites. Although sintering temperature and time increment lead to higher corundum formation in the topaz matrix (78.4 wt % Al2O3 at 975 °C for 60 min), longer residence times give place to corundum percentage decrease due to topaz reconversion. The composites' microstructure is characterized by a rectangular bar with stacked pyramidal ends and polycrystals of hexagonal plates for topaz and corundum, respectively. For the topaz/corundum composites, the maximum density was 3.05 g/cm3 (17 % porosity) for specimens sintered at 925 °C for 20 min. The glow curves of the topaz/in situ corundum composite sintered at 975 °C and 0 min dwell time show thermoluminescent peaks between 180 and 250 °C, useful for dosimetric applications. The most helpful peak (at 221 °C) in the topaz/corundum composite's glow curves determined by computational deconvolution is sharp and exhibits the highest thermoluminescent response. Dose-response analysis of the composite (sintered at 975 °C for 0 min) with the best thermoluminescent response revealed two ranges of linear behavior, the first from 2 to 200 mGy, with an adjustment of 99.9 % and the second in the range 5–300 Gy (99.8 % fitting). The thermoluminescent response improvement of the topaz/corundum composites is attributed to the corundum formed in situ during sintering. Fading rate studies of the composite with the best sintering treatment revealed a signal decrease of 4 % after 15 days, which remained constant for up to 30 days, and 8 % after 60 days. The kinetic parameters, kinetics order (b), activation energy (E), and frequency factor (s) determined using the glow peak shape method showed second-order kinetics. The topaz/corundum composite with the best TL response (975 °C, 0 min) presents an effective atomic number (Zeff) of 11.74. The detection of lower doses (mGy) and the linear response at higher doses (Gy) of beta 90Sr, together with the other thermoluminescent properties, suggest that the topaz/corundum composites sintered at 975° for 0 min dwell time may find application in radiotherapy, geological dating, and environmental dosimetry. |
| first_indexed | 2024-03-08T00:11:14Z |
| format | Article |
| id | doaj.art-835b7606d6cf41d0a40e7433cb60e399 |
| institution | Directory Open Access Journal |
| issn | 2405-8440 |
| language | English |
| last_indexed | 2024-03-08T00:11:14Z |
| publishDate | 2024-02-01 |
| publisher | Elsevier |
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| spelling | doaj.art-835b7606d6cf41d0a40e7433cb60e3992024-02-17T06:39:21ZengElsevierHeliyon2405-84402024-02-01103e25025Thermoluminescent composites of sintered synthetic-topaz/in situ corundum for dosimetry by a novel reversible processS.A. Sinclair0M.I. Pech-Canul1M.C. Acosta-Enríquez2R. Meléndrez Amavizca3Alejandro Sala Crist4J. Marcazzó5Cinvestav IPN-Saltillo. Av. Industria Metalúrgica No. 1062, Parque Industrial Saltillo-Ramos Arizpe, Ramos Arizpe, Coahuila, 25900, MexicoCinvestav IPN-Saltillo. Av. Industria Metalúrgica No. 1062, Parque Industrial Saltillo-Ramos Arizpe, Ramos Arizpe, Coahuila, 25900, Mexico; Corresponding author.Departamento de Investigación en Física, Universidad de Sonora, Blvd. Luis Encinas y Rosales S/N, Col. Centro, C.P. 83000, Hermosillo, Sonora, MexicoDepartamento de Investigación en Física, Universidad de Sonora, Blvd. Luis Encinas y Rosales S/N, Col. Centro, C.P. 83000, Hermosillo, Sonora, MexicoInstituto de Física Arroyo Seco (UNCPBA) and CIFICEN (UNCPBA e CICPBA e CONICET), Pinto 399, 7000, Tandil, ArgentinaInstituto de Física Arroyo Seco (UNCPBA) and CIFICEN (UNCPBA e CICPBA e CONICET), Pinto 399, 7000, Tandil, ArgentinaTopaz (Al2F1·44(OH)0·56SiO4)/corundum (Al2O3) composites were prepared by a facile and novel reversible process from the sintering of synthetic topaz and AlF3 powders, with corundum formed in situ into the topaz matrix. The corundum formation reaction occurs in the temperature range 875–975 °C, from 40 min sintering time, obtaining the topaz- Al2F1·44(OH)0·56SiO4/corundum- Al2O3 composites. Although sintering temperature and time increment lead to higher corundum formation in the topaz matrix (78.4 wt % Al2O3 at 975 °C for 60 min), longer residence times give place to corundum percentage decrease due to topaz reconversion. The composites' microstructure is characterized by a rectangular bar with stacked pyramidal ends and polycrystals of hexagonal plates for topaz and corundum, respectively. For the topaz/corundum composites, the maximum density was 3.05 g/cm3 (17 % porosity) for specimens sintered at 925 °C for 20 min. The glow curves of the topaz/in situ corundum composite sintered at 975 °C and 0 min dwell time show thermoluminescent peaks between 180 and 250 °C, useful for dosimetric applications. The most helpful peak (at 221 °C) in the topaz/corundum composite's glow curves determined by computational deconvolution is sharp and exhibits the highest thermoluminescent response. Dose-response analysis of the composite (sintered at 975 °C for 0 min) with the best thermoluminescent response revealed two ranges of linear behavior, the first from 2 to 200 mGy, with an adjustment of 99.9 % and the second in the range 5–300 Gy (99.8 % fitting). The thermoluminescent response improvement of the topaz/corundum composites is attributed to the corundum formed in situ during sintering. Fading rate studies of the composite with the best sintering treatment revealed a signal decrease of 4 % after 15 days, which remained constant for up to 30 days, and 8 % after 60 days. The kinetic parameters, kinetics order (b), activation energy (E), and frequency factor (s) determined using the glow peak shape method showed second-order kinetics. The topaz/corundum composite with the best TL response (975 °C, 0 min) presents an effective atomic number (Zeff) of 11.74. The detection of lower doses (mGy) and the linear response at higher doses (Gy) of beta 90Sr, together with the other thermoluminescent properties, suggest that the topaz/corundum composites sintered at 975° for 0 min dwell time may find application in radiotherapy, geological dating, and environmental dosimetry.http://www.sciencedirect.com/science/article/pii/S2405844024010569LuminescenceCompositeBiphasic materialsSinteringThermoluminescence responseDosimetry |
| spellingShingle | S.A. Sinclair M.I. Pech-Canul M.C. Acosta-Enríquez R. Meléndrez Amavizca Alejandro Sala Crist J. Marcazzó Thermoluminescent composites of sintered synthetic-topaz/in situ corundum for dosimetry by a novel reversible process Heliyon Luminescence Composite Biphasic materials Sintering Thermoluminescence response Dosimetry |
| title | Thermoluminescent composites of sintered synthetic-topaz/in situ corundum for dosimetry by a novel reversible process |
| title_full | Thermoluminescent composites of sintered synthetic-topaz/in situ corundum for dosimetry by a novel reversible process |
| title_fullStr | Thermoluminescent composites of sintered synthetic-topaz/in situ corundum for dosimetry by a novel reversible process |
| title_full_unstemmed | Thermoluminescent composites of sintered synthetic-topaz/in situ corundum for dosimetry by a novel reversible process |
| title_short | Thermoluminescent composites of sintered synthetic-topaz/in situ corundum for dosimetry by a novel reversible process |
| title_sort | thermoluminescent composites of sintered synthetic topaz in situ corundum for dosimetry by a novel reversible process |
| topic | Luminescence Composite Biphasic materials Sintering Thermoluminescence response Dosimetry |
| url | http://www.sciencedirect.com/science/article/pii/S2405844024010569 |
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