EPR of Colour Centres in Alkaline Metal Doped Calcium and Strontium Fluorides | Zendy

Hamaïdia A. | Zendy; Hachimi A. | Zendy; Margerie J. | Zendy; Hémidy J. F. | Zendy

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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.

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