The crystal structure, oxygen nonstoichiometry and chemical stability of Ba0.5Sr0.5Co0.8Fe0.2O 3-δ (BSCF)

Fang Wang, Takashi Nakamura, Keiji Yashiro, Junichiro Mizusaki, Koji Amezawa

Research output: Contribution to journalArticlepeer-review

22 Citations (Scopus)

Abstract

The oxygen nonstoichiometry and the crystal structure of Ba 0.5Sr0.5Co0.8Fe0.2O 3-δ (BSCF) were investigated by using coulometric titration, high-temperature gravimetry and in situ HT-XRD. The chemical stability diagram of BSCF was established as a function of temperature between room temperature and 1373 K and oxygen partial pressure, p(O2), between 1 and 1 × 10-21 bar. The results showed that the cubic BSCF had poor chemical stability both under highly oxidative conditions at low temperatures and highly reductive conditions at high temperatures. The phase analysis of the decomposition products showed that the chemical instability of BSCF was mainly owing to the oxidation/reduction of trivalent Co ions. This journal is

Original languageEnglish
Pages (from-to)7307-7314
Number of pages8
JournalPhysical Chemistry Chemical Physics
Volume16
Issue number16
DOIs
Publication statusPublished - 2014 Apr 28

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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