Defects in U 3+ :CaF 2 single crystals grown under different conditions by the temperature gradient technique
Abstract Defects in as‐grown U 3+ :CaF 2 crystals grown with or without PbF 2 as an oxygen scavenger were studied using Raman spectra, thermoluminescence glow curves, and additional absorption (AA) spectra induced by heating and γ‐irradiation. The effects of heating and irradiation on as‐grown U 3+...
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| Published in | physica status solidi (b) Vol. 242; no. 8; pp. 1687 - 1693 |
|---|---|
| Main Authors | , , , , , , |
| Format | Journal Article |
| Language | English |
| Published |
01.07.2005
|
| Online Access | Get full text |
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| Abstract | Abstract
Defects in as‐grown U
3+
:CaF
2
crystals grown with or without PbF
2
as an oxygen scavenger were studied using Raman spectra, thermoluminescence glow curves, and additional absorption (AA) spectra induced by heating and γ‐irradiation. The effects of heating and irradiation on as‐grown U
3+
:CaF
2
crystals are similar, accompanied by the elimination of H‐type centers and production of F‐type centers. U
3+
is demonstrated to act as an electron donor in the CaF
2
lattice, which is oxidized to the tetravalent form by thermal activation or γ‐irradiation. In the absence of PbF
2
as an oxygen scavenger, the as‐grown U
3+
:CaF
2
crystals contain many more lattice defects in terms of both quantity and type, due to the presence of O
2–
impurities. Some of these defects can recombine with each other in the process of heating and γ‐irradiation. (© 2005 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim) |
|---|---|
| AbstractList | Abstract
Defects in as‐grown U
3+
:CaF
2
crystals grown with or without PbF
2
as an oxygen scavenger were studied using Raman spectra, thermoluminescence glow curves, and additional absorption (AA) spectra induced by heating and γ‐irradiation. The effects of heating and irradiation on as‐grown U
3+
:CaF
2
crystals are similar, accompanied by the elimination of H‐type centers and production of F‐type centers. U
3+
is demonstrated to act as an electron donor in the CaF
2
lattice, which is oxidized to the tetravalent form by thermal activation or γ‐irradiation. In the absence of PbF
2
as an oxygen scavenger, the as‐grown U
3+
:CaF
2
crystals contain many more lattice defects in terms of both quantity and type, due to the presence of O
2–
impurities. Some of these defects can recombine with each other in the process of heating and γ‐irradiation. (© 2005 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim) |
| Author | Xu, Jun Yang, Weiqiao Zhou, Guoqing Zhao, Guangjun Jiang, Xiongwei Dong, Yongjun Su, Liangbi |
| Author_xml | – sequence: 1 givenname: Liangbi surname: Su fullname: Su, Liangbi – sequence: 2 givenname: Jun surname: Xu fullname: Xu, Jun – sequence: 3 givenname: Weiqiao surname: Yang fullname: Yang, Weiqiao – sequence: 4 givenname: Xiongwei surname: Jiang fullname: Jiang, Xiongwei – sequence: 5 givenname: Yongjun surname: Dong fullname: Dong, Yongjun – sequence: 6 givenname: Guangjun surname: Zhao fullname: Zhao, Guangjun – sequence: 7 givenname: Guoqing surname: Zhou fullname: Zhou, Guoqing |
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| Cites_doi | 10.1103/PhysRevB.3.516 10.1098/rspa.1970.0102 10.1063/1.1678168 10.1103/PhysRevB.48.13280 10.1063/1.117959 10.1103/PhysRevB.20.3474 10.1063/1.110969 10.1016/j.jcrysgro.2004.08.028 10.1016/S0925-8388(01)00977-X 10.1103/PhysRev.130.1790 10.1016/S0925-8388(99)00726-4 10.1103/PhysRevLett.5.557 10.1063/1.443882 10.1103/PhysRevB.41.3832 10.1103/PhysRevLett.70.3451 10.1016/0022-3093(96)00346-8 10.1016/S0022-2313(96)00366-3 10.1016/S0925-3467(97)00043-8 10.1063/1.1396833 10.1103/PhysRevB.20.3462 |
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| Snippet | Abstract
Defects in as‐grown U
3+
:CaF
2
crystals grown with or without PbF
2
as an oxygen scavenger were studied using Raman spectra, thermoluminescence glow... |
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