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Polarized luminescence and the mössbauer effect of tin impurity centres in NaCl crystals
Author(s) -
Realo E.,
Zazubovich S.
Publication year - 1973
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.2220570106
Subject(s) - impurity , quadrupole splitting , luminescence , quadrupole , crystal (programming language) , mössbauer spectroscopy , crystallography , ion , tin , type (biology) , materials science , chemistry , analytical chemistry (journal) , atomic physics , physics , optoelectronics , organic chemistry , chromatography , computer science , programming language , ecology , metallurgy , biology
Abstract An investigation is made of various types of impurity centres in NaCl;Sn and KCl:Sn crystals using the Mössbauer effect and polarized luminescence. Two types of Sn 2+ centres are found in NaCl: Sn. The centres of type I have polarized emission at 2.78 eV due to electronic transitions allowed along the C 4 axis of the crystal. A small quadrupole splitting (<0.4 mm/s) of the Mössbauer absorption line at +4.32 mm/s is observed for these centres. The centres of type II show the polarized emission at 2.3 eV due to electronic transitions allowed along the C 2 axis of the crystal. For these centres a considerable value of quadrupole splitting Δ = 0.97 mm/s of the Mössbauer lines with the isomer shift + 3.75 mm/s is found. Only the centres of the type I are found in KCl: Sn crystals. It is supposed, that the investigated centres in NaCl:Sn represent two types of associates of Sn 2+ ions with cation vacancies v c : associates with C 4V symmetry (the type I centres) and associates with C 2v symmetry (the type II centres) in the ground electronic state.