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Incorporation and Aggregation Properties of Bismuth Ions in KCl Crystals
Author(s) -
Nistor S. V.,
Stoicescu Gh.,
Mateescu C. D.
Publication year - 1990
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.2221600205
Subject(s) - bismuth , dissolution , dopant , diffusion , crystal (programming language) , ionic bonding , absorption (acoustics) , ion , analytical chemistry (journal) , absorption spectroscopy , doping , enthalpy , ionic conductivity , conductivity , spectral line , materials science , chemistry , inorganic chemistry , electrode , thermodynamics , optics , electrolyte , organic chemistry , physics , optoelectronics , astronomy , computer science , composite material , programming language
The optical absorption spectra of bismuth doped KCl crystals, grown by the Bridgman method in reactive atmosphere, reveal the presence of both Bi 3‐ and (BiO) + centers in variable ratios. The ratio changes along the crystal axis and depends on the chemical form of the dopant and its initial concentration. The shape, intensity, and peak positions of the optical spectra are sensitive to the thermal history of the crystal, reflecting the aggregation/dissolution of the centers. An apparent third‐order reaction is observed to govern the early stages of the Bi 3+ aggregation, with an activation enthalpy of 0.60 eV, in good agreement with earlier results of diffusion and ionic conductivity measurements.