Spatial distribution and interaction of defects in spinel, based on optical studies of x-ray irradiation induced processes

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Kinetic studies of optical center accumulation and decay, together with the growth and decay of radioluminescence (RL) in magnesium aluminate spinel MgAl{sub 2}O{sub 4}, were performed at room temperature. We observed two stages of defect accumulation during prolonged X-ray irradiation, as evidenced by changes in absorption bands at 3.78 and 4.15 eV related to antisite defects, and bands at 4.75 and 5.3 eV due to F-type centers. A correlation was found between optical absorption band growth and the intensities of RL bands at 4.86 and 5.02 eV, the latter of which originate: from electron-hole recombination processes. The rate of decay ... continued below

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8 p.

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Gritsyna, V. T. (Vasily T.); Kazarinov, Y. G. (Yurij G.); Kobyakov, V. A. (Volodymyr A.) & Sickafus, K. (Kurt E.) January 1, 2001.

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Kinetic studies of optical center accumulation and decay, together with the growth and decay of radioluminescence (RL) in magnesium aluminate spinel MgAl{sub 2}O{sub 4}, were performed at room temperature. We observed two stages of defect accumulation during prolonged X-ray irradiation, as evidenced by changes in absorption bands at 3.78 and 4.15 eV related to antisite defects, and bands at 4.75 and 5.3 eV due to F-type centers. A correlation was found between optical absorption band growth and the intensities of RL bands at 4.86 and 5.02 eV, the latter of which originate: from electron-hole recombination processes. The rate of decay of absorption centers and RL intensities is dependent on time after X-ray irradiation. Also both decay rates could be described by a two-stage exponential law. Results are discussed using a model that includes tunneling and recombination of electron and hole centers on spatially correlated defects located at different distances from one another.

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8 p.

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  • "Submitted to: To be presented at PRICM-4: Fourth Pacific Rim International Conference on Advanced Materials and Processing, Honolulu, Hawaii, Dec. 11-15, 2001"

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  • Report No.: LA-UR-01-3581
  • Grant Number: none
  • Office of Scientific & Technical Information Report Number: 975607
  • Archival Resource Key: ark:/67531/metadc929955

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  • January 1, 2001

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  • Nov. 13, 2016, 7:26 p.m.

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  • Dec. 12, 2016, 1:30 p.m.

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Gritsyna, V. T. (Vasily T.); Kazarinov, Y. G. (Yurij G.); Kobyakov, V. A. (Volodymyr A.) & Sickafus, K. (Kurt E.). Spatial distribution and interaction of defects in spinel, based on optical studies of x-ray irradiation induced processes, article, January 1, 2001; United States. (digital.library.unt.edu/ark:/67531/metadc929955/: accessed September 25, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.