Proton conduction and chemical stability of (La0.5Sr0.5)(Mg0.5+yNb0.5-y)O3-δ

Yuya Kawasaki; Sachio Okada; Naoki Ito; Hiroshige Matsumoto; Tatsumi Ishihara

doi:10.1016/j.materresbull.2008.04.018

Proton conduction and chemical stability of (La_0.5Sr_0.5)(Mg_0.5+yNb_0.5-y)O_3-δ

Yuya Kawasaki, Sachio Okada, Naoki Ito, Hiroshige Matsumoto, Tatsumi Ishihara

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

7 Citations (Scopus)

Abstract

Electrical conduction properties of complex perovskite-type oxides in the (La_0.5Sr_0.5)(Mg_0.5+yNb_0.5-y)O_3-δ (y = 0.02-0.06) series at intermediate-high temperatures were investigated; introduction of protons by hydration of oxide-ion vacancies was expected by increasing the Mg/Nb ratio from unity. The conductivity depended on y and a maximum conductivity was obtained at y = 0.04: σ = 4.9 × 10^-6 S cm^-1 at 400 °C in wet H₂ atmospheres. From electromotive force measurements of hydrogen and water vapor concentration cells, electrical conduction in wet H₂ atmospheres can be attributed to ionic conduction, and proton conduction is dominant below 700 °C. Unlike other perovskite-type proton conductors, (La_0.5Sr_0.5)(Mg_0.54Nb_0.46)O_3-δ was stable in CO₂ atmospheres even in the low-intermediate temperature region due to dilution of reactive strontium by lanthanum.

Original language	English
Pages (from-to)	457-461
Number of pages	5
Journal	Materials Research Bulletin
Volume	44
Issue number	2
DOIs	https://doi.org/10.1016/j.materresbull.2008.04.018
Publication status	Published - Feb 4 2009

All Science Journal Classification (ASJC) codes

Materials Science(all)
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering

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10.1016/j.materresbull.2008.04.018

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title = "Proton conduction and chemical stability of (La0.5Sr0.5)(Mg0.5+yNb0.5-y)O3-δ",

abstract = "Electrical conduction properties of complex perovskite-type oxides in the (La0.5Sr0.5)(Mg0.5+yNb0.5-y)O3-δ (y = 0.02-0.06) series at intermediate-high temperatures were investigated; introduction of protons by hydration of oxide-ion vacancies was expected by increasing the Mg/Nb ratio from unity. The conductivity depended on y and a maximum conductivity was obtained at y = 0.04: σ = 4.9 × 10-6 S cm-1 at 400 °C in wet H2 atmospheres. From electromotive force measurements of hydrogen and water vapor concentration cells, electrical conduction in wet H2 atmospheres can be attributed to ionic conduction, and proton conduction is dominant below 700 °C. Unlike other perovskite-type proton conductors, (La0.5Sr0.5)(Mg0.54Nb0.46)O3-δ was stable in CO2 atmospheres even in the low-intermediate temperature region due to dilution of reactive strontium by lanthanum.",

author = "Yuya Kawasaki and Sachio Okada and Naoki Ito and Hiroshige Matsumoto and Tatsumi Ishihara",

year = "2009",

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doi = "10.1016/j.materresbull.2008.04.018",

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T1 - Proton conduction and chemical stability of (La0.5Sr0.5)(Mg0.5+yNb0.5-y)O3-δ

AU - Kawasaki, Yuya

AU - Okada, Sachio

AU - Ito, Naoki

AU - Matsumoto, Hiroshige

AU - Ishihara, Tatsumi

PY - 2009/2/4

Y1 - 2009/2/4

N2 - Electrical conduction properties of complex perovskite-type oxides in the (La0.5Sr0.5)(Mg0.5+yNb0.5-y)O3-δ (y = 0.02-0.06) series at intermediate-high temperatures were investigated; introduction of protons by hydration of oxide-ion vacancies was expected by increasing the Mg/Nb ratio from unity. The conductivity depended on y and a maximum conductivity was obtained at y = 0.04: σ = 4.9 × 10-6 S cm-1 at 400 °C in wet H2 atmospheres. From electromotive force measurements of hydrogen and water vapor concentration cells, electrical conduction in wet H2 atmospheres can be attributed to ionic conduction, and proton conduction is dominant below 700 °C. Unlike other perovskite-type proton conductors, (La0.5Sr0.5)(Mg0.54Nb0.46)O3-δ was stable in CO2 atmospheres even in the low-intermediate temperature region due to dilution of reactive strontium by lanthanum.

AB - Electrical conduction properties of complex perovskite-type oxides in the (La0.5Sr0.5)(Mg0.5+yNb0.5-y)O3-δ (y = 0.02-0.06) series at intermediate-high temperatures were investigated; introduction of protons by hydration of oxide-ion vacancies was expected by increasing the Mg/Nb ratio from unity. The conductivity depended on y and a maximum conductivity was obtained at y = 0.04: σ = 4.9 × 10-6 S cm-1 at 400 °C in wet H2 atmospheres. From electromotive force measurements of hydrogen and water vapor concentration cells, electrical conduction in wet H2 atmospheres can be attributed to ionic conduction, and proton conduction is dominant below 700 °C. Unlike other perovskite-type proton conductors, (La0.5Sr0.5)(Mg0.54Nb0.46)O3-δ was stable in CO2 atmospheres even in the low-intermediate temperature region due to dilution of reactive strontium by lanthanum.

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Proton conduction and chemical stability of (La_0.5Sr_0.5)(Mg_0.5+yNb_0.5-y)O_3-δ

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