Stability and thermodynamic functions of lanthanum nickelates

M. Zinkevich*, N. Solak, H. Nitsche, M. Ahrens, F. Aldinger

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

53 Citations (Scopus)

Abstract

Enthalpy of formation, entropy, and heat capacity of La3Ni2O7, La4Ni3O10, and LaNiO3, which belong to the Ruddlesden-Popper homologous series were investigated using equilibration with the gas phase, adiabatic calorimetry, and differential scanning calorimetry. All three compounds remain almost stoichiometric in their stability range, while the established energetic trends are consistent with decreasing thermal stability in the order La3Ni2O7 > La4Ni3O10 > LaNiO3. The enthalpy of the structural phase transition in La3Ni2O7 at 490 K was determined. The derived thermodynamic functions were used to construct the phase stability diagram of the La-Ni-O system in terms of temperature and oxygen pressure.

Original languageEnglish
Pages (from-to)92-99
Number of pages8
JournalJournal of Alloys and Compounds
Volume438
Issue number1-2
DOIs
Publication statusPublished - 12 Jul 2007
Externally publishedYes

Funding

The authors thank to Mr. G. Kaiser for technical assistance. One of the authors (N.S.) is grateful to the International Max Planck Research School for Advanced Materials (IMPRS-AM) for financial support.

FundersFunder number
International Max Planck Research School for Advanced Materials

    Keywords

    • Calorimetry
    • Electrode materials
    • Oxide materials
    • Thermal analysis
    • Thermodynamic modeling

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