Thermal decomposition of K1 − xCsxBSi2O6 borosilicates
Thermal decomposition of mixed K 1 − x Cs x BSi 2 O 6 borosilicates by the methods of thermal analysis, annealing, and quenching, with the following refining of the structure by the Rietveld method on the example of solid solutions with x = 0.3 and 0.7 crystallizing in the space groups and , respect...
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Published in | Glass physics and chemistry Vol. 39; no. 6; pp. 659 - 663 |
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Main Authors | , , , , |
Format | Journal Article |
Language | English |
Published |
Boston
Springer US
01.11.2013
|
Subjects | |
Online Access | Get full text |
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Summary: | Thermal decomposition of mixed K
1 −
x
Cs
x
BSi
2
O
6
borosilicates by the methods of thermal analysis, annealing, and quenching, with the following refining of the structure by the Rietveld method on the example of solid solutions with
x
= 0.3 and 0.7 crystallizing in the space groups
and
, respectively, is studied. It is shown that the solid-phase decomposition of borosilicates proceeds with the release of the gas- eous phase and formation of cristobalite and/or tridymite of SiO
2
at the final stage. In this case the solid solutions enriched by potassium decompose in one stage with the formation of SiO
2
, while the solutions enriched by cesium decompose with the formation of the intermediate zeolite-like CsBSi
5
O
12
borosilicate, which also decomposes during further thermal treatment. According to the data of the structure, the refining of K
1 −
x
Cs
x
BSi
2
O
6
solid solutions obtained by thermal treatment at 1000°C for 20, 65, 80, and 100 h, it is detected that for the samples with
x
= 0.3 and 0.7 the parameter of the cubic cell of the leucite-like phase decreases and the vacancies in the position of alkaline cation appear. During the solid-phase decomposition of K
1 −
x
Cs
x
BSi
2
O
6
solid solutions the structure degrades. |
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ISSN: | 1087-6596 1608-313X |
DOI: | 10.1134/S1087659613060035 |