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Journal ArticleDOI

Preparation of glasses and ceramics from metal-organic compounds

Bulent E. Yoldas
- 01 Jun 1977 - 
- Vol. 12, Iss: 6, pp 1203-1208
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TLDR
A significant recent development in this field has been the preparation of monolithic glass and ceramic material without the need of melting or high temperature sintering as discussed by the authors, which can take place by chemical polymerization at room temperatures.
Abstract
The preparation of glass and ceramic systems from metal-organic compounds permits the mixing of the constituents at the molecular level. These mixes form clear glasses or sinter to dense bodies at temperatures considerably lower than the equivalent compositions prepared by classical methods. A significant recent development in this field has been the preparation of monolithic glass and ceramic material without the need of melting or high temperature sintering. Glass-forming reactions, previously achievable only by thermal means, can take place by chemical polymerization at room temperatures. Structural studies indicate that these materials are indeed amorphous or glassy in naturE. Thus, the often used description of glass as a “supercooled liquid” is, in the literal sense, inapplicable for these materials.

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Citations
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Invited review “sol-gel” preparation of high temperature superconducting oxides

TL;DR: A review of sol-gel preparation of high temperature superconducting oxides is presented in this paper, where different classes of gel technologies were utilized, such as hydrolysis-condensation of metal-alkoxides, gelation, and organic polymeric gel.
Journal ArticleDOI

Raman and infrared spectra on silica gel evolving toward glass

TL;DR: In this article, the infrared and Raman spectra of gels obtained from specially prepared solutions of Si(OC2H5)4 (TEOS) which have been thermally treated in the 40-800°C temperature range, are reported and discussed with reference to the spectrum of fused quartz, showing that the gel to glass transformation is an hydrolytic polycondensation process, which takes plase gradually and is practically completed in the samples treated at 800°C.
Journal ArticleDOI

New type of non-crystalline solids between inorganic and organic materials

TL;DR: In this paper, the question of whether combinations of different components are reasonable or possible on a molecular scale is addressed. And the sol-gel process is used as a useful tool in order to obtain glass related combination structures of inorganic and organic components.
Patent

Non-fused aluminum oxide-based abrasive mineral

TL;DR: In this article, a synthetic, non-fused, aluminum oxide-based abrasive mineral having a microcrystalline structure of randomly oriented crystallites comprising a dominant continuous phase of α-alumina and a secondary phase was described.
Journal ArticleDOI

Principles of hydrolysis and condensation reaction of alkoxysilanes

TL;DR: In this article, the basic results of the co-condensation of ≡ Si-C-containing with non-Si-C -containing silanes are reported and a review of papers from different fields is presented.
References
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Journal ArticleDOI

Alumina gels that form porous transparent Al2O3

TL;DR: In this paper, the authors discuss the requirements for a porous transparent Al2O3 from aluminium alkoxides to retain its integrity during drying and pyrolysis, and show that there is a critical electrolyte concentration at which the gelling volume goes through a pronounced minimum.
Journal ArticleDOI

Hydrolysis of aluminium alkoxides and bayerite conversion

TL;DR: In this article, a study of hydrolysis of aluminium alkoxides as a function of water temperature was conducted, and structural transformation of the resultant hydroxides was conducted.
Journal ArticleDOI

Preparation of ultra-high-purity submicron refractory oxides

TL;DR: In this article, a method was developed for preparing ultra-high-purity submicron powders of refractory oxides from transition metal alkoxides, where the oxides were thermally decomposed to oxides at 325° to 450°C at atmospheric pressure.
Journal ArticleDOI

Cubic Phase Stabilization of Translucent Yttria‐Zirconia at Very Low Temperatures

TL;DR: Simultaneous decomposition of yttrium and zirconium alkozides was used to obtain an almost ideal mixture of powders of high surface activity as discussed by the authors.