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

doi:10.1039/c3cp54810d

The crystal structure, oxygen nonstoichiometry and chemical stability of Ba_0.5Sr_0.5Co_0.8Fe_0.2O _3-δ (BSCF)

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

ENV - Environmental Studies for Advanced Society

Research output: Contribution to journal › Article › peer-review

35 Citations (Scopus)

Abstract

The oxygen nonstoichiometry and the crystal structure of Ba _0.5Sr_0.5Co_0.8Fe_0.2O _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 language	English
Pages (from-to)	7307-7314
Number of pages	8
Journal	Physical Chemistry Chemical Physics
Volume	16
Issue number	16
DOIs	https://doi.org/10.1039/c3cp54810d
Publication status	Published - 2014 Apr 28

ASJC Scopus subject areas

Physics and Astronomy(all)
Physical and Theoretical Chemistry

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AU - Wang, Fang

AU - Nakamura, Takashi

AU - Yashiro, Keiji

AU - Mizusaki, Junichiro

AU - Amezawa, Koji

PY - 2014/4/28

Y1 - 2014/4/28

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AB - 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

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The crystal structure, oxygen nonstoichiometry and chemical stability of Ba_0.5Sr_0.5Co_0.8Fe_0.2O _3-δ (BSCF)

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