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- W2091200315 abstract "A new assignment of IR absorption bands of mullite is presented on the basis of empirical studies in the 1400–400 cm−1 vibrational range of mullite-type compounds in the systems Al2O3–SiO2, Al2O3–GeO2, Ga2O3–GeO2, and Al2O3–Me2O, Ga2O3–Me2O (Me=Na, K, Rb). The powder samples were prepared by heat treatment of sol–gel derived precursor powders and by reaction sintering of oxide powders. The FTIR powder spectra of Al–Si, Al–Ge, and Ga–Ge mullite compounds are characterized by three band groups, designated as (a), (b) and (c). Due to the lack of group (a) bands in the alkaline aluminate and gallate spectra, this high-energetic band group is assigned to SiO and GeO stretching vibrations. Group (b) bands are essentially determined by AlO and GaO stretching vibrations with Al and Ga on T sites in tetrahedral coordination and by TOT bending modes, while the low-energetic group (c) bands are due to AlO and GaO stretching vibrations in octahedral structural units. Details of the vibrational modes are discussed on the basis of the deconvoluted spectra." @default.
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- W2091200315 date "2002-11-01" @default.
- W2091200315 modified "2023-09-25" @default.
- W2091200315 title "A new assignment of IR vibrational modes in mullite" @default.
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- W2091200315 doi "https://doi.org/10.1016/s0924-2031(02)00030-9" @default.
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