Fluorescence line narrowing was used to measure the homogeneous broadening of the 2-4A2 transition of Cr3+ ions in Al(1) sites, within the spinel blocks, of crystalline silver β-alumina. The homogeneous linewidth increases as T1.74 in the temperature range 7–200 K. This temperature evolution is interpreted as being caused by the interaction between impurity ions and two-level systems, as usually observed in glasses. The glasslike behavior of β-alumina is related to disorder which is present in the conduction planes and which is the origin of the superionic conductivity of this compound.
TEMPERATURE-DEPENDENCE OF HOMOGENEOUS SPECTRAL WIDTHS OF THE 2E-4A2 TRANSITION OF CR-3+ IN SILVER BETA-ALUMINA
MARIOTTO, Gino;
1988-01-01
Abstract
Fluorescence line narrowing was used to measure the homogeneous broadening of the 2-4A2 transition of Cr3+ ions in Al(1) sites, within the spinel blocks, of crystalline silver β-alumina. The homogeneous linewidth increases as T1.74 in the temperature range 7–200 K. This temperature evolution is interpreted as being caused by the interaction between impurity ions and two-level systems, as usually observed in glasses. The glasslike behavior of β-alumina is related to disorder which is present in the conduction planes and which is the origin of the superionic conductivity of this compound.
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