Thermoluminescence and thermal properties of rare-earth-ion-activated YAG crystals

The paper contains results of studies of repeated thermoluminescence of yttrium-aluminum garnet (YAG) crystals (Y_3−xLn_xAl₅O₁₂, x=0, 2) activated by rare earth ions (Pr³⁺, Nd³⁺, Tb³⁺, Dy³⁺, Ho³⁺, Er³⁺) previously exposed to⁶⁰Co γ-radiation at 77 K and subjected to many cooling-heating cycles. A possible mechanism of repeated thermoluminescence is considered from the viewpoint of a dynamic evolutionary approach. The thermal conductivity of YAG-TR³⁺ crystals (TR³⁺: Gd³⁺, Tb³⁺, Dy³⁺, Er³⁺, Tm³⁺, and Lu³⁺) is studied to establish its relation with repeated thermoluminescence. Presented at the National Conference on Molecular Spectroscopy, Samarkand (Uzbekistan), September 25–27, 1996. Samarkand State University, 15, University Blvd., 703004, Samarkand, Republic of Uzbekistan. Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 65, No. 1, pp. 137–140, January–February, 1998.