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EPR of Colour Centres in Alkaline Metal Doped Calcium and Strontium Fluorides
Author(s) -
Hamaïdia A.,
Hachimi A.,
Margerie J.,
Hémidy J. F.
Publication year - 1986
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.2221370106
Subject(s) - electron paramagnetic resonance , strontium , doping , ion , chemistry , sodium , lithium (medication) , crystallography , metal , alkaline earth metal , nuclear magnetic resonance , materials science , physics , medicine , organic chemistry , endocrinology , optoelectronics
The EPR is studied of F A centres in CaF 2 :Li + , CaF 2 :Na + , and SrF 2 :Na + . In CaF 2 :Li + , the spectrum is very similar to that of F centres in pure CaF 2 : the superhyperfine coupling constant with lithium is unmeasurable. On the other hand, in CaF 2 :Na + and SrF 2 :Na + , the superhyperfine coupling with a sodium nucleus is noticeable. The EPR of so‐called “F 2A ” centres in the same matrices is also observed, which corroborates our previous magnetic circular dichroism conclusions: “F 2A ” centres do not correspond to two electrons in two adjoining anion vacancies with a substitutional sodium in close vicinity. From the observed superhyperfine structure, it is not yet found what is the genuine microscopic structure of these “F 2A ” centres.