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Aggregation of Mn 2+ ‐Cation Vacancy Dipoles in KCl Matrix
Author(s) -
Cywiński R.,
Mugeński E.,
NowyWiechuła W.,
Wiechuła J.
Publication year - 1985
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.2221290218
Subject(s) - photoluminescence , luminescence , annealing (glass) , vacancy defect , kinetics , activation energy , analytical chemistry (journal) , dipole , chemistry , terbium , materials science , crystallography , physics , optoelectronics , quantum mechanics , organic chemistry , chromatography , composite material
The aggregation kinetics of Mn 2+ ‐cation‐vacancy dipoles in the KCl matrix is examined by ESR and photoluminescence methods at room temperature. In dependence on the annealing (aging) conditions four different Mn 2+ aggregation products appear in the crystal: luminescent dipole aggregates (no ESR line) formed during short annealing at room temperature, two non‐luminescent Mn 2+ ‐rich microprecipitates (K 4 MnCl 6 and MnCl 2 ) yielding distinct ESR lines, and a non‐luminescent aggregation product not yielding any detectable ESR line. The activation energies obtained for the Mn 2+ emission decay at higher temperatures suggest that after a rapid, initial phasetransition like process (0.1 eV) the further slow decay is conditioned by Mn 2+ diffusion (0.6 eV).
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