The effect of polymorphic structure on the structural and chemical stability of yttrium disilicates

Evgeny Galunin, Miquel Vidal, María D. Alba

Результат исследований: Материалы для журналаСтатьярецензирование

2 Цитирования (Scopus)

Аннотация

Under pressure and temperature conditions like those found in deep geological repositories (DGRs), rare-earth cations may react with silicates to form rare-earth disilicates. This study establishes the stabil-ity range of yttrium disilicates in response to changes in pH. The a, ß, ?, and d polymorphs of Y2Si2O7 were synthesized by the sol-gel process at temperatures between 1100 and 1650 °C and subjected to pHstat leaching tests. By measuring the Y and Si leaching rates and monitoring the transformation of the crystalline and amorphous phases, we showed that yttrium disilicates were stable at pH > 5. At pH < 5, the pH stability sequence was consistent with the temperature-dependent stabilities of Y2Si2O7 phases, with the d polymorph showing the lowest leaching rates. Because rare-earth compounds can be used as a proxy for analogous actinide hosts, the results of this study can be used to predict the performance of engineered barriers in DGR.

Язык оригиналаАнглийский
Страницы (с-по)1512-1520
Число страниц9
ЖурналAmerican Mineralogist
Том96
Номер выпуска10
DOI
СостояниеОпубликовано - окт 2011
Опубликовано для внешнего пользованияДа

ASJC Scopus subject areas

  • Geophysics
  • Geochemistry and Petrology

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