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Abstract
Diffusion of thallous ions in single crystals of KBr has been investigated within the temperature range 350–700°C. After heating pure KBr crystals in TlBr vapour, the distribution of Tl + in the crystals was found by measuring the absorption spectrum as successive layers were removed from the crystals by polishing. The activation energy for diffusion is 1.03 eV. The temperature dependence of the diffusion coefficient confirms the substitutional nature of the luminescence centre in KBr(Tl).
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