Development of proton conductors using pyrochlore-perovskite phase boundaries

Scott A. Speakman; Robert D. Carneim; E. Andrew Payzant; Timothy R. Armstrong

doi:10.1361/10599490419270

Development of proton conductors using pyrochlore-perovskite phase boundaries

Scott A. Speakman, Robert D. Carneim, E. Andrew Payzant, Timothy R. Armstrong

Materials Engineering

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

14 Scopus citations

Abstract

The pyrochlore-perovskite binary systems La ₂Zr ₂O ₇-SrZrO ₃ and La ₂Zr ₂O ₇-LaYO ₃ were studied as potential high-temperature proton conductors. X-ray diffraction and direct current conductivity measurements were used to develop empirical relationships between structure and conductivity. The solubilities of Sr in La ₂Zr ₂O ₇ and La in SrZrO ₃ were low, less than 0.1 mol fraction. The solubility of Zr in LaYO ₃ was at least 0.125 mol fraction, and the solubility of Y in La ₂Zr ₂O ₇ was at least 0.25 mol fraction. Y-doped La ₂Zr ₂O ₇ had the highest electrical conductivity, though no composition exceeded σ = 3 × 10 ^-4 S/cm at the target temperature of 600°C. The effectiveness of Y as a dopant in La ₂Zr ₂O ₇ was limited because Y substituted for both La on the A-site and Zr on the B-site.

Original language	English
Pages (from-to)	303-308
Number of pages	6
Journal	Journal of Materials Engineering and Performance
Volume	13
Issue number	3
DOIs	https://doi.org/10.1361/10599490419270
State	Published - Jun 2004

Funding

Research sponsored by the Laboratory Directed Research and Development Program of Oak Ridge National Laboratory (ORNL), managed by UT-Battelle, LLC for the U. S. Department of Energy under Contract No. DE-AC05-00OR22725.

Funders	Funder number
U.S. Department of Energy	DE-AC05-00OR22725
Oak Ridge National Laboratory
UT-Battelle

Keywords

Conductivity
Doping
Structure-property relationship
X-ray diffraction

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10.1361/10599490419270

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title = "Development of proton conductors using pyrochlore-perovskite phase boundaries",

abstract = "The pyrochlore-perovskite binary systems La 2Zr 2O 7-SrZrO 3 and La 2Zr 2O 7-LaYO 3 were studied as potential high-temperature proton conductors. X-ray diffraction and direct current conductivity measurements were used to develop empirical relationships between structure and conductivity. The solubilities of Sr in La 2Zr 2O 7 and La in SrZrO 3 were low, less than 0.1 mol fraction. The solubility of Zr in LaYO 3 was at least 0.125 mol fraction, and the solubility of Y in La 2Zr 2O 7 was at least 0.25 mol fraction. Y-doped La 2Zr 2O 7 had the highest electrical conductivity, though no composition exceeded σ = 3 × 10 -4 S/cm at the target temperature of 600°C. The effectiveness of Y as a dopant in La 2Zr 2O 7 was limited because Y substituted for both La on the A-site and Zr on the B-site.",

keywords = "Conductivity, Doping, Structure-property relationship, X-ray diffraction",

author = "Speakman, {Scott A.} and Carneim, {Robert D.} and Payzant, {E. Andrew} and Armstrong, {Timothy R.}",

year = "2004",

month = jun,

doi = "10.1361/10599490419270",

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journal = "Journal of Materials Engineering and Performance",

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T1 - Development of proton conductors using pyrochlore-perovskite phase boundaries

AU - Speakman, Scott A.

AU - Carneim, Robert D.

AU - Payzant, E. Andrew

AU - Armstrong, Timothy R.

PY - 2004/6

Y1 - 2004/6

N2 - The pyrochlore-perovskite binary systems La 2Zr 2O 7-SrZrO 3 and La 2Zr 2O 7-LaYO 3 were studied as potential high-temperature proton conductors. X-ray diffraction and direct current conductivity measurements were used to develop empirical relationships between structure and conductivity. The solubilities of Sr in La 2Zr 2O 7 and La in SrZrO 3 were low, less than 0.1 mol fraction. The solubility of Zr in LaYO 3 was at least 0.125 mol fraction, and the solubility of Y in La 2Zr 2O 7 was at least 0.25 mol fraction. Y-doped La 2Zr 2O 7 had the highest electrical conductivity, though no composition exceeded σ = 3 × 10 -4 S/cm at the target temperature of 600°C. The effectiveness of Y as a dopant in La 2Zr 2O 7 was limited because Y substituted for both La on the A-site and Zr on the B-site.

AB - The pyrochlore-perovskite binary systems La 2Zr 2O 7-SrZrO 3 and La 2Zr 2O 7-LaYO 3 were studied as potential high-temperature proton conductors. X-ray diffraction and direct current conductivity measurements were used to develop empirical relationships between structure and conductivity. The solubilities of Sr in La 2Zr 2O 7 and La in SrZrO 3 were low, less than 0.1 mol fraction. The solubility of Zr in LaYO 3 was at least 0.125 mol fraction, and the solubility of Y in La 2Zr 2O 7 was at least 0.25 mol fraction. Y-doped La 2Zr 2O 7 had the highest electrical conductivity, though no composition exceeded σ = 3 × 10 -4 S/cm at the target temperature of 600°C. The effectiveness of Y as a dopant in La 2Zr 2O 7 was limited because Y substituted for both La on the A-site and Zr on the B-site.

KW - Conductivity

KW - Doping

KW - Structure-property relationship

KW - X-ray diffraction

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DO - 10.1361/10599490419270

M3 - Article

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EP - 308

JO - Journal of Materials Engineering and Performance

JF - Journal of Materials Engineering and Performance

IS - 3

ER -

Development of proton conductors using pyrochlore-perovskite phase boundaries

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Keywords

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