THERMOCHEMICAL STUDIES OF SILICATE, ALUMINOSILICATE, AND OROSILICATE GLASSES.

Alexandra Navrotsky, Richard Hervig, Bimalendu N. Roy, Maria Huffman

Research output: Contribution to journalConference articlepeer-review

9 Scopus citations

Abstract

High temperature calorimetry has been used to determine enthalpies of mixing and of vitrification and fusion in silicate, aluminosilicate, and borosilicate systems. The systems Na//2O-Al//2O//3-SiO//2 and Na//2O-B//2O//3-SiO//2 show contrasting behavior. In the former, the join SiO//2-NaAlO//2 shows large energetic stabilization near Al/(Al plus Si) equals 0. 5, whereas in the latter, much less pronounced stabilization is seen along the join SiO//2-NaBO//2. More B//2O//3-rich compositions, e. g. , the join SiO//2-Na//0//. //3//1B//1//. //2//3O//2 (B/Na equals 4) show substantial positive heats of mixing, presumably related to immiscibility. Thermodynamic data for the complete Na//2O-B//2O//3-SiO//2 ternary system are being developed. Borosilicate glasses are a leading candidate for immobilization of high-level nuclear waste; thus their thermodynamic characterization is important to predicting the long-term stability of such depositories.

Original languageEnglish (US)
Pages (from-to)133-150
Number of pages18
JournalHigh temperature science
Volume19
Issue number2
StatePublished - Apr 1 1984
EventProc of the 4th Int Conf on High Temp and Energy-Relat Mater, Pt 2 - Santa Fe, NM, USA
Duration: Apr 1 1984Apr 6 1984

ASJC Scopus subject areas

  • Engineering(all)

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