Study of trapping centers in undoped Al₂O₃ crystals using thermoluminescence methods
The energy spectra of trapping centers (TC) in specially undoped α-AI₂O₃ crystals within temperature range of 80 to 500 К have been studied using thermoluminescence (TL). In this work, the oscillation regularity revealed before in the TC energy spectrum has been studied in more detail as well as the...
Збережено в:
| Дата: | 2005 |
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| Автори: | , , |
| Формат: | Стаття |
| Мова: | English |
| Опубліковано: |
НТК «Інститут монокристалів» НАН України
2005
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| Назва видання: | Functional Materials |
| Онлайн доступ: | http://dspace.nbuv.gov.ua/handle/123456789/140062 |
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| Назва журналу: | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| Цитувати: | Study of trapping centers in undoped Al₂O₃ crystals using thermoluminescence methods / A.F. Gumenjuk, S.Yu. Kutovyi, M.O. Grebenovych // Functional Materials. — 2005. — Т. 12, № 1. — С. 72-77. — Бібліогр.: 12 назв. — англ. |
Репозитарії
Digital Library of Periodicals of National Academy of Sciences of Ukraine| Резюме: | The energy spectra of trapping centers (TC) in specially undoped α-AI₂O₃ crystals within temperature range of 80 to 500 К have been studied using thermoluminescence (TL). In this work, the oscillation regularity revealed before in the TC energy spectrum has been studied in more detail as well as the decay features of some anomalously broad TL peaks. The values of the TC thermal activation energy form the single oscillation series
En = πωtl(n +1/2), πωtl = 64 2 cm⁻¹ (0.079 eV). The corresponding Raman line 645 ciri1 is the highest frequency of the full-symmetric Ag modes. This regularity is concluded to be due to the polaron nature of the traps. A method has been proposed to establish the cause of TL peak broadening, i.e., to determine its structure. The TL peak at 280 К has been shown to have a complex structure being a superposition of at least two elementary peaks close to one another. The intensity of the complex peak low-temperature component increases faster than that of the high-temperature one as the light sum rises. |
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