Effect of B-site substitution on the stability of La0.2Sr0.8Fe0.8B0.2O3− δ , B=Al, Ga, Cr, Ti, Ta, Nb

Ørjan Fossmark Lohne; Jonas Gurauskis; Tan Nhut Phung; Mari-Ann  Einarsrud; Tor Grande; Henry J.M. Bouwmeester; Kjell Wiik

doi:10.1016/j.ssi.2012.02.061

Effect of B-site substitution on the stability of La_0.2Sr_0.8Fe_0.8B_0.2O_{3− δ}, B=Al, Ga, Cr, Ti, Ta, Nb

Ørjan Fossmark Lohne, Jonas Gurauskis, Tan Nhut Phung, Mari-Ann Einarsrud, Tor Grande, Henry J.M. Bouwmeester, Kjell Wiik

Research output: Contribution to journal › Journal article › Research › peer-review

Abstract

Abstract: Single phase, cubic perovskites of composition La_0.2 Sr _0.8 Fe _0.8 B _0.2 O _{3− δ}, B=Al, Ga, Cr, Ti, Ta and Nb, were prepared by spray pyrolysis from aqueous precursor solutions. The effect of B-site substitution on the stability in a H₂ containing atmosphere was investigated using temperature programmed reduction (TPR). High temperature X-ray diffraction (HT-XRD) was performed under conditions similar to those in the TPR experiments. La_0.2 Sr _0.8 FeO _{3− δ} forms a brownmillerite-type anion-deficient ordered perovskite upon reduction at T ≈500. B-site substitution suppresses oxygen vacancy ordering, maintaining a perovskite structure under the above reducing conditions up to T ≈700°C. Trends in the kinetics of decomposition of B-site substituted La_0.2 Sr _0.8 FeO _{3− δ} are discussed.

Original language	English
Journal	Solid State Ionics
Volume	225
Pages (from-to)	186-189
ISSN	0167-2738
DOIs	https://doi.org/10.1016/j.ssi.2012.02.061
Publication status	Published - 2012
Externally published	Yes

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@article{dcbca815816348bf97fb8ebb2c6cc8cb,

title = "Effect of B-site substitution on the stability of La0.2Sr0.8Fe0.8B0.2O3− δ , B=Al, Ga, Cr, Ti, Ta, Nb",

abstract = "Abstract: Single phase, cubic perovskites of composition La0.2 Sr 0.8 Fe 0.8 B 0.2 O 3− δ , B=Al, Ga, Cr, Ti, Ta and Nb, were prepared by spray pyrolysis from aqueous precursor solutions. The effect of B-site substitution on the stability in a H2 containing atmosphere was investigated using temperature programmed reduction (TPR). High temperature X-ray diffraction (HT-XRD) was performed under conditions similar to those in the TPR experiments. La0.2 Sr 0.8 FeO 3− δ forms a brownmillerite-type anion-deficient ordered perovskite upon reduction at T ≈500. B-site substitution suppresses oxygen vacancy ordering, maintaining a perovskite structure under the above reducing conditions up to T ≈700°C. Trends in the kinetics of decomposition of B-site substituted La0.2 Sr 0.8 FeO 3− δ are discussed.",

author = "Lohne, {{\O}rjan Fossmark} and Jonas Gurauskis and Phung, {Tan Nhut} and Mari-Ann Einarsrud and Tor Grande and Bouwmeester, {Henry J.M.} and Kjell Wiik",

year = "2012",

doi = "10.1016/j.ssi.2012.02.061",

language = "English",

volume = "225",

pages = "186--189",

journal = "Solid State Ionics",

issn = "0167-2738",

publisher = "Elsevier",

}

TY - JOUR

T1 - Effect of B-site substitution on the stability of La0.2Sr0.8Fe0.8B0.2O3− δ , B=Al, Ga, Cr, Ti, Ta, Nb

AU - Lohne, Ørjan Fossmark

AU - Gurauskis, Jonas

AU - Phung, Tan Nhut

AU - Einarsrud, Mari-Ann

AU - Grande, Tor

AU - Bouwmeester, Henry J.M.

AU - Wiik, Kjell

PY - 2012

Y1 - 2012

N2 - Abstract: Single phase, cubic perovskites of composition La0.2 Sr 0.8 Fe 0.8 B 0.2 O 3− δ , B=Al, Ga, Cr, Ti, Ta and Nb, were prepared by spray pyrolysis from aqueous precursor solutions. The effect of B-site substitution on the stability in a H2 containing atmosphere was investigated using temperature programmed reduction (TPR). High temperature X-ray diffraction (HT-XRD) was performed under conditions similar to those in the TPR experiments. La0.2 Sr 0.8 FeO 3− δ forms a brownmillerite-type anion-deficient ordered perovskite upon reduction at T ≈500. B-site substitution suppresses oxygen vacancy ordering, maintaining a perovskite structure under the above reducing conditions up to T ≈700°C. Trends in the kinetics of decomposition of B-site substituted La0.2 Sr 0.8 FeO 3− δ are discussed.

AB - Abstract: Single phase, cubic perovskites of composition La0.2 Sr 0.8 Fe 0.8 B 0.2 O 3− δ , B=Al, Ga, Cr, Ti, Ta and Nb, were prepared by spray pyrolysis from aqueous precursor solutions. The effect of B-site substitution on the stability in a H2 containing atmosphere was investigated using temperature programmed reduction (TPR). High temperature X-ray diffraction (HT-XRD) was performed under conditions similar to those in the TPR experiments. La0.2 Sr 0.8 FeO 3− δ forms a brownmillerite-type anion-deficient ordered perovskite upon reduction at T ≈500. B-site substitution suppresses oxygen vacancy ordering, maintaining a perovskite structure under the above reducing conditions up to T ≈700°C. Trends in the kinetics of decomposition of B-site substituted La0.2 Sr 0.8 FeO 3− δ are discussed.

U2 - 10.1016/j.ssi.2012.02.061

DO - 10.1016/j.ssi.2012.02.061

M3 - Journal article

SN - 0167-2738

VL - 225

SP - 186

EP - 189

JO - Solid State Ionics

JF - Solid State Ionics