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Thermochemistry of glass forming Y-substituted Sr-analogues of titanite (SrTiSiO5)

Published online by Cambridge University Press:  31 January 2011

Tae-Jin Park ,
Simon Li  and
Alexandra Navrotsky
Tae-Jin Park
Affiliation:
Peter A. Rock Thermochemistry Laboratory, University of California at Davis, Davis, California 95616; and NEAT ORU, University of California at Davis, Davis, California 95616
Simon Li
Affiliation:
Peter A. Rock Thermochemistry Laboratory, University of California at Davis, Davis, California 95616; and NEAT ORU, University of California at Davis, Davis, California 95616
Alexandra Navrotsky*
Affiliation:
Peter A. Rock Thermochemistry Laboratory, University of California at Davis, Davis, California 95616; and NEAT ORU, University of California at Davis, Davis, California 95616
*
a) Address all correspondence to this author. e-mail: [email protected]
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Abstract

Strontium titanium silicates are possible oxide forms for immobilization of short lived fission products in radioactive waste. Through beta decay, strontium decays to yttrium, and then to zirconium. Therefore, not only the stability of Sr-loaded waste forms, but also that of a potential decay product series with charge-balance in a naturally occurring mineral or a ceramic is of fundamental importance. Strontium titanosilicate (SrTiSiO5) is the Sr-analogue of titanite (CaTiSiO5). To incorporate the reaction 3Sr2+ = 2Y3+ + vacancy in the titanite composition, Y-substituted Sr-analogues of titanite, (Sr1–xY2/3x)TiSiO5 (x = 0, 0.25, 0.5, 0.75) were prepared by high temperature synthesis and were found to form glass upon cooling. The Y-end-member (Y2/3TiSiO5, x = 1) crystallized to a mixture of Y2TiSiO7, TiO2, and SiO2 upon quenching in air. The enthalpies of formation of Y-substituted Sr-titanite glasses were obtained from drop solution calorimetry in a molten lead borate (2PbO·B2O3) solvent at 702 °C. The enthalpies of formation from constituent oxides are exothermic but become less so with increasing Y content. The thermodynamic stability of the Y-substituted Sr-analogue of crystalline titanite may become marginal with increasing yttrium content.

Keywords

CalorimetrySrWaste management
Type
Articles
Information
Journal of Materials Research , Volume 24 , Issue 11 , November 2009 , pp. 3380 - 3386
Copyright
Copyright © Materials Research Society 2009

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