Abstract
Thin crystalline solid films of KBr 1– x I x :Tl + were prepared from a melt by a cell method and impurity absorption spectra were investigated at 11 K for the whole composition range. In the middle composition range no spectral traces of phase separation were observed, indicating that the films were in a state equivalent to that of a supersaturated solid solution. The A band of KBr:Tl + and that of KI:Tl + were persistent with each other and two additional bands attributable to the A bands of the mixed crystals were apparent in the range of 0.01≤ x≤0.5. According to the results of Gaussian fitting of the bands, it was evident that two of them have threshold compositions with increasing I − ion composition x. In addition, the I − ion concentration around the impurities was found to be greater than the I − ion composition of the host materials. These findings are discussed in terms of a model, according to which the bands are associated with various I − ion configurations around the impurities.
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