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Influence of Yttria concentration upon Electrical Properties and Susceptibility to Ageing of Yttria-stabilised Zirconia

Research output: Contribution to journalArticlepeer-review

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Influence of Yttria concentration upon Electrical Properties and Susceptibility to Ageing of Yttria-stabilised Zirconia. / Gibson, IR; Dransfield, GP; Irvine, John Thomas Sirr.

In: Journal of the European Ceramic Society, Vol. 18, 1998, p. 661-667.

Research output: Contribution to journalArticlepeer-review

Harvard

Gibson, IR, Dransfield, GP & Irvine, JTS 1998, 'Influence of Yttria concentration upon Electrical Properties and Susceptibility to Ageing of Yttria-stabilised Zirconia', Journal of the European Ceramic Society, vol. 18, pp. 661-667.

APA

Gibson, IR., Dransfield, GP., & Irvine, J. T. S. (1998). Influence of Yttria concentration upon Electrical Properties and Susceptibility to Ageing of Yttria-stabilised Zirconia. Journal of the European Ceramic Society, 18, 661-667.

Vancouver

Gibson IR, Dransfield GP, Irvine JTS. Influence of Yttria concentration upon Electrical Properties and Susceptibility to Ageing of Yttria-stabilised Zirconia. Journal of the European Ceramic Society. 1998;18:661-667.

Author

Gibson, IR ; Dransfield, GP ; Irvine, John Thomas Sirr. / Influence of Yttria concentration upon Electrical Properties and Susceptibility to Ageing of Yttria-stabilised Zirconia. In: Journal of the European Ceramic Society. 1998 ; Vol. 18. pp. 661-667.

Bibtex - Download

@article{230bbe48c6974e67b5e48cf00affc0d1,
title = "Influence of Yttria concentration upon Electrical Properties and Susceptibility to Ageing of Yttria-stabilised Zirconia",
abstract = "The most widely used electrolyte in solid oxide fuel cell (SOFC) devices is 8 mol% yttria-stablished zirconia (YSZ). Recent investigations have questioned the long term stability of this material at both the SOFC operating temperature of 1000 degrees C and during cycling between room temperature and 1000 degrees C. One possible method of improving the stability is by increasing the yttria concentration. Previous studies, utilising a number of different commercial YSZ powders have suggested that this may be possible, however, there were other differences between the samples in addition to yttria-content, notably impurity concentration. Thus the importance of yttria concentration has not been unambiguously demonstrated and the optimal content of yttria has not been determined In this study, the mechanical strength and ionic conductivity of a range of ultra-pure compositions from the (ZrO2)(1-x)(Y2O3)(x) system close to 8 mol% yttria-stabilised zirconia, x = 0.08, have been investigated. 8.5 mol% YSZ was found to have comparable mechanical strength and ionic conductivity to conventional 8 mol% YSZ, but showed improved stability. On ageing at typical fuel cell operating temperatures, i.e. 1000 degrees C, the conductivity of samples with yttria contents of 8.5 mol%, or higher, changed little; however, conductivity values for compositions with lower yttria contents decreased by 10-15%. These results strongly suggest that optimal properties are obtained for the minimum yttrium composition required to fully stabilise the cubic polymorph at the temperature of operation. (C) 1998 Elsevier Science Limited. All rights reserved.",
keywords = "SOLID ELECTROLYTES, CONDUCTIVITY",
author = "IR Gibson and GP Dransfield and Irvine, {John Thomas Sirr}",
year = "1998",
language = "English",
volume = "18",
pages = "661--667",
journal = "Journal of the European Ceramic Society",
issn = "0955-2219",
publisher = "Elsevier",

}

RIS (suitable for import to EndNote) - Download

TY - JOUR

T1 - Influence of Yttria concentration upon Electrical Properties and Susceptibility to Ageing of Yttria-stabilised Zirconia

AU - Gibson, IR

AU - Dransfield, GP

AU - Irvine, John Thomas Sirr

PY - 1998

Y1 - 1998

N2 - The most widely used electrolyte in solid oxide fuel cell (SOFC) devices is 8 mol% yttria-stablished zirconia (YSZ). Recent investigations have questioned the long term stability of this material at both the SOFC operating temperature of 1000 degrees C and during cycling between room temperature and 1000 degrees C. One possible method of improving the stability is by increasing the yttria concentration. Previous studies, utilising a number of different commercial YSZ powders have suggested that this may be possible, however, there were other differences between the samples in addition to yttria-content, notably impurity concentration. Thus the importance of yttria concentration has not been unambiguously demonstrated and the optimal content of yttria has not been determined In this study, the mechanical strength and ionic conductivity of a range of ultra-pure compositions from the (ZrO2)(1-x)(Y2O3)(x) system close to 8 mol% yttria-stabilised zirconia, x = 0.08, have been investigated. 8.5 mol% YSZ was found to have comparable mechanical strength and ionic conductivity to conventional 8 mol% YSZ, but showed improved stability. On ageing at typical fuel cell operating temperatures, i.e. 1000 degrees C, the conductivity of samples with yttria contents of 8.5 mol%, or higher, changed little; however, conductivity values for compositions with lower yttria contents decreased by 10-15%. These results strongly suggest that optimal properties are obtained for the minimum yttrium composition required to fully stabilise the cubic polymorph at the temperature of operation. (C) 1998 Elsevier Science Limited. All rights reserved.

AB - The most widely used electrolyte in solid oxide fuel cell (SOFC) devices is 8 mol% yttria-stablished zirconia (YSZ). Recent investigations have questioned the long term stability of this material at both the SOFC operating temperature of 1000 degrees C and during cycling between room temperature and 1000 degrees C. One possible method of improving the stability is by increasing the yttria concentration. Previous studies, utilising a number of different commercial YSZ powders have suggested that this may be possible, however, there were other differences between the samples in addition to yttria-content, notably impurity concentration. Thus the importance of yttria concentration has not been unambiguously demonstrated and the optimal content of yttria has not been determined In this study, the mechanical strength and ionic conductivity of a range of ultra-pure compositions from the (ZrO2)(1-x)(Y2O3)(x) system close to 8 mol% yttria-stabilised zirconia, x = 0.08, have been investigated. 8.5 mol% YSZ was found to have comparable mechanical strength and ionic conductivity to conventional 8 mol% YSZ, but showed improved stability. On ageing at typical fuel cell operating temperatures, i.e. 1000 degrees C, the conductivity of samples with yttria contents of 8.5 mol%, or higher, changed little; however, conductivity values for compositions with lower yttria contents decreased by 10-15%. These results strongly suggest that optimal properties are obtained for the minimum yttrium composition required to fully stabilise the cubic polymorph at the temperature of operation. (C) 1998 Elsevier Science Limited. All rights reserved.

KW - SOLID ELECTROLYTES

KW - CONDUCTIVITY

UR - http://www.scopus.com/inward/record.url?scp=0041177655&partnerID=8YFLogxK

M3 - Article

VL - 18

SP - 661

EP - 667

JO - Journal of the European Ceramic Society

JF - Journal of the European Ceramic Society

SN - 0955-2219

ER -

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