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The absorption spectra of Y 3 Fe 5 O 12 and Y 3 Ga 5 O 12 :Fe 3+ to 5.5 eV
Author(s) -
Scott G. B.,
Page J. L.
Publication year - 1977
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.2220790121
Subject(s) - spectral line , absorption spectroscopy , analytical chemistry (journal) , absorption (acoustics) , impurity , materials science , atomic physics , chemistry , physics , optics , organic chemistry , chromatography , astronomy , composite material
The absorption spectrum of Y 3 Fe 6 0 12 (YIG) is obtained to 40000 cm −1 and analysed by Gaussian fitting to the spectrum of ε 0 obtained from the absorption data and the known refractive index behaviour. The energies of the major components agree well with those obtained in Y 3 Ga 5 O 12 :Fe 3+ . Comparison of the spectra of Y 3 Fe 0.09 Ga 5 .O 12 and YIG indicates that all transitions below 35000 cm −1 involve Fe 3+ pairs and that the first charge transfer transition between the oxygen 2p band and the iron d‐like bands occurs at 35600 and 37400 cm −1 in YIG and Y 3 Fe 0.09 Ga 4.91 O 12 respectively with an oscillator strength of approximately 0.1. An assignment is forwarded for the pair bands in terms of intersublattice Fe 3+ charge transfer transitions with reasonable agreement between the expected and observed energies and intensities. An example of the use of the density of states plot, obtained from the analysis, to explain the features of impurity absorption spectra in YIG is given for YIG:Si.