Thermochemistry of rare-earth aluminate and aluminosilicate glasses

Yahong Zhang, Alexandra Navrotsky

Research output: Contribution to journalArticlepeer-review

31 Scopus citations

Abstract

A series of REAlO3-composition glasses (RE=La, Pr, Nd, Sm, Gd) were synthesized using containerless processing techniques. DSC shows no evidence of a glass transition prior to crystallization. Onset crystallization temperature increases with decreasing ionic radius of the rare-earth. Transposed temperature drop calorimetry (from room temperature to 1078 K) determined the enthalpies of vitrification at 298 K. Their large values confirm that REAlO 3 compositions are reluctant glass formers. For glasses along the 2REAlO3-3SiO2 join, strongly negative heats of mixing support the absence of miscibility gaps except possibly for very high silica content. Enthalpies of mixing become more exothermic with increasing basicity (larger size) of substituting RE3+.

Original languageEnglish (US)
Pages (from-to)141-151
Number of pages11
JournalJournal of Non-Crystalline Solids
Volume341
Issue number1-3
DOIs
StatePublished - Aug 1 2004
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Condensed Matter Physics
  • Materials Chemistry

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