Thermodynamics of glass formation and metastable solidification of molten Y3Al5O12

I. Ching Lin, Alexandra Navrotsky, J. K.Richard Weber, Paul C. Nordine

Research output: Contribution to journalArticlepeer-review

39 Scopus citations

Abstract

Drop solution calorimetry was used to determine the enthalpy of solution in lead borate for three different materials with the chemical composition Y3Al5O12. Crystalline yttrium aluminum garnet (YAG), a crystalline mixture of 3 YAlO3 (perovskite) plus Al2O3 (α-alumina), and a glass, were all synthesized by containerless melting and cooling. The enthalpies of drop-dissolution per mole of Y3Al5O12 were 472.49 ± 4.19, 440.35 ± 3.59, and 196.02 ± 3.39 kJ/mol, respectively, for the garnet, the crystalline mixture, and the glass. The garnet phase is thermodynamically stable with respect to the corresponding mixture of α-alumina and perovskite confirming that the two phase mixture is metastable. The enthalpy of vitrification of YAG is 276.47 ± 5.40 kJ/mol (13.82 ± 0.27 kJ/g atom). This high value for the enthalpy of vitrification is related to the reluctant glass forming ability of the YAG composition. The heat of fusion of Y3Al2O12 is estimated to be 25.8 kJ/g atom or 516 kJ/mol at its melting point, 2240 K.

Original languageEnglish (US)
Pages (from-to)273-276
Number of pages4
JournalJournal of Non-Crystalline Solids
Volume243
Issue number2-3
DOIs
StatePublished - 1999
Externally publishedYes

ASJC Scopus subject areas

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

Fingerprint Dive into the research topics of 'Thermodynamics of glass formation and metastable solidification of molten Y<sub>3</sub>Al<sub>5</sub>O<sub>12</sub>'. Together they form a unique fingerprint.

Cite this