Author： Klyuev V.P. Pevzner B. Z.
Publisher： Society of Glass Technology
ISSN： 0031-9090
Source： Physics and Chemistry of Glasses - European Journal of Glass Science and Technology Part B, Vol.44, Iss.2, 2003-04, pp. : 121-124
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Abstract
The thermal expansion of alkali aluminoborate and alkaline earth aluminoborate glasses is investigated. It is revealed that introduction of Al2O can increase (for small R2O and RO content) the structural thermal expansion coefficient (STEC) values of glasses. As a rule, with an increase of Al2O3 content, minima for T g versus [Al2O3] are observed. The highest values of STEC are observed for lithium aluminoborate glasses and the lowest values are for barium aluminoborate glasses. Transition temperatures of calcium aluminoborate glasses are largest and those of sodium aluminoborate glasses are smallest. The dependencies of properties of the glasses on their compositions can be explained satisfactorily by coordination changes of boron and by the appearance and disappearance of a layer structure formed by boroxol rings.
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