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Infrared Frequency Calculations for Ideal Mullite (3Al 2 O 3 ·2SiO 2 )
Author(s) -
MACKENZIE K. J. D.
Publication year - 1972
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1972.tb11211.x
Subject(s) - mullite , infrared , stoichiometry , distortion (music) , infrared spectroscopy , mineralogy , materials science , silicate , chemistry , physics , optics , quantum mechanics , composite material , organic chemistry , amplifier , ceramic , optoelectronics , cmos
Simplified structural models for mullite were investigated, and ir frequencies were calculated for the simplest model which gave the theoretical number of ir‐active frequencies compatible with the observed spectrum. This model, which consists of independently vibrating structural units, gives plausible frequency assignments which agree well with other published data for silicates and aluminates. These assignments explain the spectral changes observed during formation of mullite from heated clay minerals. The model does not take into account the changes in stoichiometry and distortion caused by compositional variations.