Energetics of Ternary Nitrides: Li-Ca-Zn-N and Ca-Ta-N Systems

J. M. McHale, A. Navrotsky, Glen R. Kowach, Vincent E. Balbarin, F. J. Disalvo

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47 Scopus citations


High-temperature oxide melt drop solution calorimetry was used to study the energetics of ternary nitride formation. The standard enthalpies of formation of several binary and ternary nitrides were determined. These values in kJ mol-1 are ΔHfo(Li3N) = -166.1 ± 4.8, ΔHfo(Ca3N2) = -439.7 ± 6.6, ΔHfo(Zn3N2) = -43.5 ± 4.1, ΔHfo(Ta3N5) = -849.7 ± 11.7, ΔHfo(Ca2ZnN2) = -378.9 ± 8.6, ΔHfo(Sr2ZnN2) = -385.6 ± 14.3, ΔHfo(LiCaN) = -216.8 ± 10.8, ΔHfo(LiZnN) = -137.5 ± 6.8, and ΔHfo(CaTaN2) = -643.8 ± 9.6. These enthalpies of formation are small in magnitude compared to analogous values for oxides. However, the enthalpies of formation of the ternaries from binary nitrides can be quite substantial, confirming significant energetic stabilization of ternary nitrides. The energetics of ternary nitride formation appears to be dominated by the acid/base character of the cations. A linear relationship was found between the enthalpies of formation of the ternaries from binary nitrides and the ionic potential ratio of the two cations.

Original languageEnglish (US)
Pages (from-to)1538-1546
Number of pages9
JournalChemistry of Materials
Issue number7
StatePublished - Jul 1997
Externally publishedYes

ASJC Scopus subject areas

  • General Chemistry
  • General Chemical Engineering
  • Materials Chemistry


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