Electrical conductivity of Cr                         
                        2
                                                 O                         
                        3
                                                 -doped Y                         
                        2
                                                 O                         
                        3
                                                 -stabilized ZrO                         
                        2

Manikprage Jayaratna; Masahiro Yoshimura; Shigeyuki Sōmiya

doi:10.1007/BF01132932

Electrical conductivity of Cr ₂ O ₃ -doped Y ₂ O ₃ -stabilized ZrO ₂

Manikprage Jayaratna, Masahiro Yoshimura, Shigeyuki Sōmiya

Department of Materials Science and Engineering

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

24 Citations (Scopus)

Abstract

The electrical conductivity of Cr ₂ O ₃ -doped Y ₂ O ₃ -stabilized ZrO ₂ (YSZ) has been studied as functions of composition, temperature and oxygen pressure. The specimens have been prepared by hot preoning of co precipitated oxides to yield >99.7% density. The Cr ₂ O ₃ added above the solubility limit (≈ 0.7 mol %) precipitated as a secondary phase at the grain boundaries. The conductivity of Cr ₂ O ₃ -doped YSZ was almost independent of the oxygen pressure in the range 10 ¹⁸ to 10 ⁵ Pa, indicating a dominant ionic condition. The electronic conductivity of dopant CR ₂ O ₃ would be hindered by the higher ionic conductivity in the p _O2 ranges studied. The conductivity and the activation energy for conduction decreased slightly with the addition of Cr ₂ O ₃ . These phenomena seemed to be caused by vacancy trapping or polarization at the grain boundaries with the Cr ₂ O ₃ precipitates. The samples with 1 mol % Cr ₂ O ₃ addred to zirconia containing various Y ₂ O ₃ contents showed similar conduction behaviour to those without Cr ₂ O ₃ addition; that is, the conductivity maxima are observed at around 8 mol % Y ₂ O ₃ addition to zirconia, and the activation energies increased with tha Y ₂ O ₃ addition.

Original language	English
Pages (from-to)	2011-2016
Number of pages	6
Journal	Journal of Materials Science
Volume	22
Issue number	6
DOIs	https://doi.org/10.1007/BF01132932
Publication status	Published - 1987 Jan 1

All Science Journal Classification (ASJC) codes

General Materials Science
Mechanics of Materials
Mechanical Engineering

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10.1007/BF01132932

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Jayaratna, M., Yoshimura, M., & Sōmiya, S. (1987). Electrical conductivity of Cr ₂ O ₃ -doped Y ₂ O ₃ -stabilized ZrO ₂ Journal of Materials Science, 22(6), 2011-2016. https://doi.org/10.1007/BF01132932

Jayaratna, Manikprage ; Yoshimura, Masahiro ; Sōmiya, Shigeyuki. / Electrical conductivity of Cr ₂ O ₃ -doped Y ₂ O ₃ -stabilized ZrO ₂ In: Journal of Materials Science. 1987 ; Vol. 22, No. 6. pp. 2011-2016.

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title = " Electrical conductivity of Cr 2 O 3 -doped Y 2 O 3 -stabilized ZrO 2 ",

abstract = " The electrical conductivity of Cr 2 O 3 -doped Y 2 O 3 -stabilized ZrO 2 (YSZ) has been studied as functions of composition, temperature and oxygen pressure. The specimens have been prepared by hot preoning of co precipitated oxides to yield >99.7% density. The Cr 2 O 3 added above the solubility limit (≈ 0.7 mol %) precipitated as a secondary phase at the grain boundaries. The conductivity of Cr 2 O 3 -doped YSZ was almost independent of the oxygen pressure in the range 10 18 to 10 5 Pa, indicating a dominant ionic condition. The electronic conductivity of dopant CR 2 O 3 would be hindered by the higher ionic conductivity in the p O2 ranges studied. The conductivity and the activation energy for conduction decreased slightly with the addition of Cr 2 O 3 . These phenomena seemed to be caused by vacancy trapping or polarization at the grain boundaries with the Cr 2 O 3 precipitates. The samples with 1 mol % Cr 2 O 3 addred to zirconia containing various Y 2 O 3 contents showed similar conduction behaviour to those without Cr 2 O 3 addition; that is, the conductivity maxima are observed at around 8 mol % Y 2 O 3 addition to zirconia, and the activation energies increased with tha Y 2 O 3 addition.",

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Jayaratna, M, Yoshimura, M & Sōmiya, S 1987, ' Electrical conductivity of Cr ₂ O ₃ -doped Y ₂ O ₃ -stabilized ZrO ₂ ', Journal of Materials Science, vol. 22, no. 6, pp. 2011-2016. https://doi.org/10.1007/BF01132932

Electrical conductivity of Cr ₂ O ₃ -doped Y ₂ O ₃ -stabilized ZrO ₂ . / Jayaratna, Manikprage; Yoshimura, Masahiro; Sōmiya, Shigeyuki.
In: Journal of Materials Science, Vol. 22, No. 6, 01.01.1987, p. 2011-2016.

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

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N2 - The electrical conductivity of Cr 2 O 3 -doped Y 2 O 3 -stabilized ZrO 2 (YSZ) has been studied as functions of composition, temperature and oxygen pressure. The specimens have been prepared by hot preoning of co precipitated oxides to yield >99.7% density. The Cr 2 O 3 added above the solubility limit (≈ 0.7 mol %) precipitated as a secondary phase at the grain boundaries. The conductivity of Cr 2 O 3 -doped YSZ was almost independent of the oxygen pressure in the range 10 18 to 10 5 Pa, indicating a dominant ionic condition. The electronic conductivity of dopant CR 2 O 3 would be hindered by the higher ionic conductivity in the p O2 ranges studied. The conductivity and the activation energy for conduction decreased slightly with the addition of Cr 2 O 3 . These phenomena seemed to be caused by vacancy trapping or polarization at the grain boundaries with the Cr 2 O 3 precipitates. The samples with 1 mol % Cr 2 O 3 addred to zirconia containing various Y 2 O 3 contents showed similar conduction behaviour to those without Cr 2 O 3 addition; that is, the conductivity maxima are observed at around 8 mol % Y 2 O 3 addition to zirconia, and the activation energies increased with tha Y 2 O 3 addition.

AB - The electrical conductivity of Cr 2 O 3 -doped Y 2 O 3 -stabilized ZrO 2 (YSZ) has been studied as functions of composition, temperature and oxygen pressure. The specimens have been prepared by hot preoning of co precipitated oxides to yield >99.7% density. The Cr 2 O 3 added above the solubility limit (≈ 0.7 mol %) precipitated as a secondary phase at the grain boundaries. The conductivity of Cr 2 O 3 -doped YSZ was almost independent of the oxygen pressure in the range 10 18 to 10 5 Pa, indicating a dominant ionic condition. The electronic conductivity of dopant CR 2 O 3 would be hindered by the higher ionic conductivity in the p O2 ranges studied. The conductivity and the activation energy for conduction decreased slightly with the addition of Cr 2 O 3 . These phenomena seemed to be caused by vacancy trapping or polarization at the grain boundaries with the Cr 2 O 3 precipitates. The samples with 1 mol % Cr 2 O 3 addred to zirconia containing various Y 2 O 3 contents showed similar conduction behaviour to those without Cr 2 O 3 addition; that is, the conductivity maxima are observed at around 8 mol % Y 2 O 3 addition to zirconia, and the activation energies increased with tha Y 2 O 3 addition.

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Jayaratna M, Yoshimura M, Sōmiya S. Electrical conductivity of Cr ₂ O ₃ -doped Y ₂ O ₃ -stabilized ZrO ₂ Journal of Materials Science. 1987 Jan 1;22(6):2011-2016. doi: 10.1007/BF01132932

Electrical conductivity of Cr ₂ O ₃ -doped Y ₂ O ₃ -stabilized ZrO ₂

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