The Influence of Plastic Deformation on Thermal Bleaching of Colour Centres in Potassium Chloride Crystals Irradiated by γ Rays
1964; Wiley; Volume: 6; Issue: 3 Linguagem: Inglês
10.1002/pssb.19640060309
ISSN1521-3951
Autores Tópico(s)Mineralogy and Gemology Studies
ResumoAbstract The thermal bleaching of F centres in the temperature range between 106 and 185 °C is found to occur in plastically deformed KCl crystals as well as in non‐deformed ones. In both cases the activation energy of the process is found to be equal to 1.30 ± 0.02 eV per F centre. The bleaching mechanism is considered to arise from the diffusion of anion vacancies. The decrease of the bleaching rate in deformed material is tentatively explained by the increase of the mean “micrograin” diameter.
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