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Effect of Solid Dilution and Temperature on the Crystal Field Spectra of Chromium Ions in Single Crystals of Chrome Alum
Author(s) -
Kesavamoorthy R.,
Krishnaswamy R.
Publication year - 1981
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.2221080203
Subject(s) - alum , chromium , ion , crystal (programming language) , paramagnetism , diamagnetism , analytical chemistry (journal) , absorption spectroscopy , chemistry , single crystal , spectral line , dilution , crystal field theory , materials science , crystallography , magnetic field , condensed matter physics , thermodynamics , optics , physics , organic chemistry , chromatography , computer science , quantum mechanics , astronomy , programming language
The optical absorption spectra of mixed single crystals of chrome alum and potash alum are studied for different concentrations at room temperature and for one concentration at different temperatures between 100 and 310 K. The cubic crystal field splitting parameter D q , and the interelectronic repulsion parameter B are obtained using the observed values of the peak positions. It is found that D q , B , and half width at half maxima Γ of the spectral bands associated with the paramagnetic chromium ion in chrome alum do not change on replacing varying amounts of chromium ions with the diamagnetic aluminium ions. The temperature dependence of Γ is explained on the basis of the vibronic transition and that of D q on the basis of the results of crystal field theory. A simple model is proposed to explain the temperature dependence of B .