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Self‐diffusion of cesium‐134 and diffusion of rubidium‐86 in cesium iodide single crystals
Author(s) -
Klotsman S. M.,
Polikarpova I. P.,
Timofeev A. N.
Publication year - 1972
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2220490204
Subject(s) - caesium , rubidium , diffusion , halide , alkali metal , impurity , chemistry , analytical chemistry (journal) , ion , radius , ionic radius , self diffusion , activation energy , atmospheric temperature range , iodide , atomic physics , inorganic chemistry , potassium , thermodynamics , physics , computer security , self service , organic chemistry , chromatography , marketing , computer science , business
The self‐diffusion of Cs‐134 and the diffusion of Rb‐86 in CsI single crystals were measured in the temperature range 404 to 603 °C using the tracer‐sectioning technique. The temperature dependencies of diffusion coefficients are D = (17.6 −1.5 +1.7 ) exp [−(35460 ± 140)/ RT ] cm 2 s −1 for Cs‐134 and D = (27.3 −2.7 +3.0 ) exp [−(34540 ± 160)/ RT ] cm 2 s −1 for Rb‐86. Comparison of present data with earlier results on diffusion parameters of Na‐22 in CsI single crystals shows that there is no dependence of the activation energy Q on characteristics of the homovalent impurities. On the other hand, the pre‐exponential factor D 0 increases steadily with decreasing ion radius of the diffusing cations. The independence of Q on homovalent impurity characteristics is in qualitative agreement with known anomalous properties of cations with small ion radii in alkali halide crystals and with the expected temperature dependence of the correiation factor.