Thermodynamics of BaNd2O4 and phase diagram of the BaO-Nd2O3 system

Weiping Gong, Alexandra Navrotsky

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

The BaNd2O4 compound and the BaO-Nd2O3 system are of interest for electroceramics. In this work, we synthesized BaNd2O4 by solid-state reaction, measured its heat capacity from 573 to 1273 K by differential scanning calorimetry, and determined its enthalpy of formation from component oxides at 298 K by high-temperature oxide melt solution calorimetry to be -43.75 ± 4.68 kJ/mol. Our newly determined values and available literature data were employed to assess the phase equilibria in the BaO-Nd2O3 system using CALPHAD methodology. A self-consistent thermodynamic database and the calculated phase diagram of the BaO-Nd2O3 system are provided. The optimized thermodynamic parameters are in good agreement with available experimental data. BaNd2O4 is calculated to melt incongruently at 2177 K. This thermodynamic analysis is essential for the optimization of synthesis conditions for materials and for the evaluation of their stability under appropriate technological operating conditions.

Original languageEnglish (US)
Pages (from-to)3337-3342
Number of pages6
JournalJournal of Materials Research
Volume34
Issue number19
DOIs
StatePublished - Oct 14 2019
Externally publishedYes

Keywords

  • calorimetry
  • electronic materials
  • phase equilibria

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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