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Hyperfine structure of Cr 5+ EPR spectra in X‐irradiated potassium halide crystals doped with CrO 4 2− and Ca 2+
Author(s) -
Akchalov Sh.,
Alybakov A.,
Zhanibekov M.,
Karashev T. K.,
Tojchiev N.
Publication year - 1987
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.2170220917
Subject(s) - hyperfine structure , electron paramagnetic resonance , chemistry , ion , halide , irradiation , crystallography , spectral line , analytical chemistry (journal) , potassium , oxygen , inorganic chemistry , nuclear magnetic resonance , atomic physics , physics , organic chemistry , astronomy , chromatography , nuclear physics
The hyperfine structure has been investigated in the EPR spectra of X‐irradiated KCl: CrO 4 2− , Ca 2+ and KBr: CrO 4 2− , Ca 2+ crystals. Preliminarily spectra were simplified by means of heating the crystals up to 400 K for KCl and 440 K for KBr, that destroys the less stable CrO 4 3−· V a +centers. It is ascertained, that principal directions of g ‐ and A ‐tensors do not coincide, and principal A ‐values are determined. Calculations, making use of the experimental meanings of g ‐ and A ‐tensor components, showed, that the degree of distortion of oxygen tetrahedra in CrO 4 3−· Ca 2+ · V a +centers is almost the same in both KCl and KBr crystals; besides, these calculations suggest the existence of a strong covalent bonding between the central Cr 5+ ion and four oxygen ligands in CrO 4 3−ions.