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Raman microscopy study of basic aluminum sulfate
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Journal Article
Raman microscopy study of basic aluminum sulfate
1999
Overview
The tridecameric aluminum polymer [AlO4Al12(OH)24(H2O)12]7+ was prepared by forced hydrolysis of Al3+ up to an OH/Al molar ratio of 2.2. Upon addition of sulfate the tridecamer crystallised as the monoclinic basic aluminum sulfate Na0.1[AlO4Al12(OH)12(H2O)12](SO4)3.55. These crystals have been studied using FT-Raman microscopy and compared to the basic aluminum nitrate, Na2SO4·xH2O and Al2(SO4)3·xH2O. The Raman spectrum of basic aluminum sulfate is dominated by two broad bands which are assigned to the ν1 and ν3 bands at 981 and 1051 cm− 1 of the sulfate group in the Al13 sulfate structure. Furthermore the band at 724 cm− 1 is assigned to an Al–O mode of the polymerised Al–O–Al bonds in the Al13 Keggin structure. The sharp band at 1066 cm− 1 and the minor band at 1384 cm− 1 are interpreted to be due to a small amount of nitrate impurity on a different position in the structure than the nitrate present in the Al13 nitrate crystal structure, based on the shift in band position of both the ν1 symmetric stretching and ν3 asymmetric stretching modes.
Publisher
Springer,Springer Nature B.V
Subject
/ Condensed matter: electronic structure, electrical, magnetic, and optical properties
/ Condensed matter: structure, mechanical and thermal properties
/ Crystals
/ Exact sciences and technology
/ Infrared and raman spectra and scattering
/ Nitrates
/ Other nonmetallic inorganics
/ Physics
