High-Resolution Thermochemical Study of Phase Stability and Rapid Oxygen Incorporation in YBaCo 4- x Zn x O 7+δ 114-Cobaltites

D. S. Tsvetkov, P. S. Maram, N. S. Tsvetkova, A. Yu Zuev, A. Navrotsky

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

The formation thermodynamics of YBaCo 4-x Zn x O 7+δ (x = 0, 1, and 3) oxides was determined by high-temperature oxide melt solution calorimetry. All of the studied oxides are thermodynamically metastable due to the tendency of cobalt to increase the oxidation state under oxidizing conditions as well as to significant bond valence sum mismatch for Ba and Y in 114-oxides. Complex phase evolution in YBaCo 4 O 7+δ at 350-400 °C upon oxygen absorption was revealed using incremental precise oxygen dosing. The calorimetric results support phase changes seen during in situ X-ray diffraction structural studies and provide high-resolution measurement of the amount and energetics of oxygen absorbed by YBaCo 4-x Zn x O 7+δ under equilibrium conditions.

Original languageEnglish (US)
Pages (from-to)9597-9604
Number of pages8
JournalJournal of Physical Chemistry A
Volume122
Issue number50
DOIs
StatePublished - Dec 20 2018
Externally publishedYes

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

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