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Impurities and Charge Compensation in Some Molybdenium Oxides
Author(s) -
Grunin V. S.,
Patrina I. B.
Publication year - 1984
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.2221230138
Subject(s) - electronegativity , electron paramagnetic resonance , impurity , unpaired electron , spectral line , condensed matter physics , chemistry , lattice (music) , materials science , crystallography , molecular physics , nuclear magnetic resonance , physics , organic chemistry , astronomy , acoustics
The role of impurities in the defect formation in MoO 3 and Na 2 Mo 2 O 7 crystals is discussed. The EPR spectra of the X‐ray and uv‐irradiation centres are investigated. The constants of the appropriate spin‐Hamiltonians are obtained. It is shown that the localization radius of an electron (or a hole) exceeds the interatomic distances, therefore the EPR spectra have a low symmetry with noncoincident axes of the A ‐ and g ‐tensors. The unpaired density distribution depends on the characteristics of the lattice and impurity cations such as the electronegativity, the coordination number, and the degree of the local environment symmetry distortion.