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首页> 外文期刊>Journal of Materials Research >Thermochemistry of glass forming Y-substituted Sr-analogues of titanite(SrTiSiO_5)
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Thermochemistry of glass forming Y-substituted Sr-analogues of titanite(SrTiSiO_5)

机译：钛酸盐（SrTiSiO_5）形成玻璃的Y取代Sr类似物的热化学

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摘要

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 (SrTiSiO_5) is the Sr-analogue of titanite (CaTiSiO_5). To incorporate the reaction 3Sr~(2+) = 2Y~(3+) + vacancy in the titanite composition, Y-substituted Sr-analogues of titanite, (Sr_(1-x)Y_(2/3x)) TiSiO_5 (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 (Y_(2/3)TiSiO_5, x = 1) crystallized to a mixture of Y_2Ti_2O_7, TiO_2, and SiO_2 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·B_2O_3) solvent at 702 ℃. 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.
机译：硅酸锶钛是可能的氧化物形式，可用于将放射性裂变产物中的短寿命裂变产物固定化。通过β衰变，锶会衰变成钇，然后衰变成锆。因此，不仅是Sr废物形式的稳定性，而且是天然矿物或陶瓷中具有电荷平衡的潜在衰变产物系列的稳定性都至关重要。钛硅酸锶（SrTiSiO_5）是钛酸盐（CaTiSiO_5）的Sr类似物。为了将3Sr〜（2+）= 2Y〜（3+）+空位反应纳入钛矿组成中，Y取代钛矿的Sr类似物（Sr_（1-x）Y_（2 / 3x））TiSiO_5（x ＝ 0、0.25、0.5、0.75）通过高温合成制备，并且发现冷却时形成玻璃。在空气中淬火后，Y端成员（Y_（2/3）TiSiO_5，x = 1）结晶为Y_2Ti_2O_7，TiO_2和SiO_2的混合物。通过在熔融硼酸铅（2PbO·B_2O_3）溶剂中于702℃滴加溶液量热法获得Y取代的Sr-钛铁矿玻璃的形成焓。由组成氧化物形成的焓是放热的，但是随着Y含量的增加而变小。随着钇含量的增加，晶体钛矿的Y-取代的Sr-类似物的热力学稳定性可能变得微不足道。

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  • 来源
    《Journal of Materials Research》 |2009年第11期|3380-3386|共7页
  • 作者

    Tae-Jin Park; Simon Li; Alexandra Navrotsky;

  • 作者单位

    Peter A. Rock Thermochemistry Laboratory, University of California at Davis, Davis, California 95616 NEAT ORU, University of California at Davis, Davis, California 95616;

    Peter A. Rock Thermochemistry Laboratory, University of California at Davis, Davis, California 95616 NEAT ORU, University of California at Davis, Davis, California 95616;

    Peter A. Rock Thermochemistry Laboratory, University of California at Davis, Davis, California 95616 NEAT ORU, University of California at Davis, Davis, California 95616;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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