THE PREPARATION, PROPERTIES AND STRUCTURE OF CARBONATE GLASSES. Interim Report, October 1, 1962-August 1, 1963
The principal objective of this research is to explore pressure- temperature conditions of formation of unusual glasses containing large amounts of volatile components, and to measure their physical and chemical properties. The principal glasses investigated included: (A) those for which there is no conventional network former, and (B) modification of common network formers by volatile constituents. Under group (A) glasses were prepared which are composed entirely of carbonates and many glasses were prepared with mixed volatile components, including carbonates. Under (B) glasses were prepared by the addition of gases such as CO/sub 2/, H/sub 2/O, A, F, Cl, and SO/sub 3/, under elevated pressures in the conventional glass composition and the solubility of volatile-containing compounds such as hydroxides, carbonates, sulfates, and nitrates, was determined in the conventional glasses. Research on the pure carbonate glasses has revolved around substitutions which would permit extending the properties of these glasses. It was found possible to maintain the glass structure by fairly large additions of lanthanum carbonate and minor additions of such things as manganese and lead. It now appears that there will be no wide spread area of carbonate glasses, but only restricted compositions in the vicinity of the potassium-magnesium composition. Complex volatile glasses containing no silica or other common network former were also prepared over a narrow range of compositions. Sulfate, hydroxide, fluoride, carbonate were put in as compounds in glass-forming mixtures. The incorporation of volatile compounds into conventional glasses was also investigated. The alkali-lime- silica glasses, for example, will take large amounts of water into solution; it is, in fact, possible to prepare glasses having all compositions intermediate between a window glass composition andpure water at high pressure and the corresponding physical properties of the glass change in more or less a continuous manner. For example, it is possible to prepare glass having the consistency of putty or the consistency of brittle substance. Under the pressures utilized, water seems to be one of the most soluble volatile constituents, although CO/sub 2/, SO/sub 3/, and F also can enter into these glasses readily. Apparently, pressure is the controlling factor and if pressure could be increased considerably over that available for these experiments, presumably other volatiles would also dissolve in the glasses. Many of these glasses, both carbonate and silicate glasses with volatiles, can be vesiculated by heating at atmospheric pressure. ln many cases, the volume of the resulting product is 100 or more times that of the initial glass, so that a foam-like glass is produced. (auth)
- Research Organization:
- Pennsylvania State Univ., University Park
- DOE Contract Number:
- AT(30-1)-2887
- NSA Number:
- NSA-17-037149
- OSTI ID:
- 4636729
- Report Number(s):
- TID-19397
- Resource Relation:
- Other Information: Orig. Receipt Date: 31-DEC-63
- Country of Publication:
- United States
- Language:
- English
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