Hydrolysis of molybdenum and tungsten alkoxides: sols, powders and films

Hydrolysis of molybdenum and tungsten alkoxides of the two series MO(OEt) 4 and MO 2(OEt) 2 (M = Mo, W) has been studied. Hydrolysis products and the partially hydrolyzed solutions have been characterized by means of X-ray diffraction, IR, electron spectroscopy and small-angle X-ray scattering. Prep...

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Published in:Journal of non-crystalline solids 1990, Vol.124 (2), p.155-166
Main Authors: Yanovskaya, M.I, Obvintseva, I.E, Kessler, V.G, Galyamov, B.Sh, Kucheiko, S.I, Shifrina, R.R, Turova, N.Ya
Format: Article
Language:English
Subjects:
Chemistry
Colloidal state and disperse state
Exact sciences and technology
General and physical chemistry
Physical and chemical studies. Granulometry. Electrokinetic phenomena
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cited_by cdi_FETCH-LOGICAL-c394t-8a89f4189c3fcf5c64f994caa4ddc4f0209fa0627f77dca361f0e0873ca835823
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container_title Journal of non-crystalline solids
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creator Yanovskaya, M.I
Obvintseva, I.E
Kessler, V.G
Galyamov, B.Sh
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Shifrina, R.R
Turova, N.Ya
description Hydrolysis of molybdenum and tungsten alkoxides of the two series MO(OEt) 4 and MO 2(OEt) 2 (M = Mo, W) has been studied. Hydrolysis products and the partially hydrolyzed solutions have been characterized by means of X-ray diffraction, IR, electron spectroscopy and small-angle X-ray scattering. Preparation of stable sols is reported and their structures are discussed in terms of a fractal model. While ‘tungsten solutions’ may be described as typical polymeric sols, ‘molybdenum solutions’ should be regarded as particulate sols. The reason for this difference has its origin in the structures of alkoxides and mechanisms of their hydrolysis. Sols were used for the preparation of electrochromic and photochromic films by spin-coating techniques. A coloration mechanism is discussed in terms of the percolation model. Some properties of the composite structures WO 3TiO 2, n-SiWO 3 are also reported.
doi_str_mv 10.1016/0022-3093(90)90258-N
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subjects Chemistry
Colloidal state and disperse state
Exact sciences and technology
General and physical chemistry
Physical and chemical studies. Granulometry. Electrokinetic phenomena
title Hydrolysis of molybdenum and tungsten alkoxides: sols, powders and films
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