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Thermally stimulated processes involving defects in γ‐ and x‐irradiated spinel (MgAl2O4)

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4 Author(s)
Lorincz, A. ; Department of Physics and Astronomy, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27514 ; Puma, M. ; James, F.J. ; Crawford, J.H.

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Thermally stimulated conductivity (TSC) and thermally stimulated luminescence (TSL) of spinel single crystals exposed to ionizing radiation have been studied. TSC exhibits peaks at 70, 125, and 340 °C whereas TSL peaks occur at 70 and 260 °C. The 70 °C peak has an activation energy of 0.95 eV and is due to electron release; it has two main spectral components at 260 nm (4.8 eV) and 310 nm (4.0 eV) due to electron capture at trapped holes. The 260 °C TSL peak is broad but singly activated (1.5 eV activation) and is dominated by 710 nm (1.75 eV) and 520 nm (2.39 eV) emission due to hole capture at Cr2+ and V2+, respectively. The broad 340° TSC peak appears to contain a substantial contribution due to electron release in the 240–310 °C range which makes only a small contribution (260 and 310‐nm light) to the TSL peak in this region. Dose dependence and room‐temperature decay indicate that initially a substantial portion of the 260‐nm afterglow is due to tunneling recombination.

Published in:

Journal of Applied Physics  (Volume:53 ,  Issue: 2 )

Date of Publication:

Feb 1982

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