Premium
Correlation of Infra‐Red Spectra with Structural Distortions in the Spinel Series Mg(Cr x Al 2− x )O 4
Author(s) -
Grimes N. W.,
Collett A. J.
Publication year - 1971
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.2220430218
Subject(s) - spinel , octahedron , spectral line , tetrahedron , crystallography , chemistry , series (stratigraphy) , formula unit , infrared spectroscopy , absorption (acoustics) , infrared , symmetry (geometry) , oxygen , analytical chemistry (journal) , materials science , physics , crystal structure , geometry , mathematics , optics , geology , paleontology , organic chemistry , chromatography , metallurgy , astronomy
The details of the infra‐red spectra over the range 200 to 1000 cm −1 are presented for eight members of the spinel series Mg(Cr x Al 2− x )O 4 and correlated with the development of local distortions of C 3v symmetry. It is shown that the frequency behaviour of two of the prominent absorption bands is described rather well by the equations given by Waldron for the modes labelled v 1 and v 3 . Force constants k 1 and k 0 , corresponding to unit displacements along the tetrahedral cation‐oxygen and octahedral cation‐oxygen bonds, respectively, are derived in a manner which allows for the presence of other interactions.