Infrared spectra of fluoride garnets

The i.r. spectra of a series of first-row transition metal fluoride garnets (Na 3 M 2Li 3F 12) have been studied in the region 4000 –50 cm −1. The vibrational frequencies are grouped into two classes: those which depend upon the unit cell edge, or the size of the transition metal ion; and those show...

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Bibliographic Details
Published in:Spectrochimica acta. Part A: Molecular spectroscopy 1979, Vol.35 (3), p.209-211
Main Authors: Langley, Richard H., Sturgeon, George D.
Format: Article
Language:English
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Summary:The i.r. spectra of a series of first-row transition metal fluoride garnets (Na 3 M 2Li 3F 12) have been studied in the region 4000 –50 cm −1. The vibrational frequencies are grouped into two classes: those which depend upon the unit cell edge, or the size of the transition metal ion; and those showing no such dependence. The bands which depend upon the transition metal ion are assigned to the normal modes of an octahedral group which have been split by the crystallographic site symmetry, S 6. Of the seventeen modes predicted by factor group analysis, fourteen were observed. The assignments of these frequencies differ in some cases from those previously reported. Several data involving the inactive ν 6 mode of the nominal octahedron are reported.
ISSN:0584-8539
DOI:10.1016/0584-8539(79)80138-5