The effect of Bi2O3 on the microstructure and electrical conductivity of ZrO2-Y2O3 ceramics

Kim, Y. H.; Kim, H. G.

doi:10.1007/bf00921248

Cited by 10 publications

(11 citation statements)

References 17 publications

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“…As reported by several authors [12,14] that segregation of impurities along grain boundaries decreases the conductivity to greater extent, our finding is also in line with the observed phenomenon. Though we could not observe a continuous network of grain boundary in all our samples analyzed under SEM, liquid phase sintering causes the segregation of Bi 2 O 3 -rich phase as an island and may facilitate the formation of Bi 7.38 Zr 0.62 O 12.31 phase at the interface, which may be responsible for higher ionic conductivity.…”

Section: Resultssupporting

confidence: 95%

Synthesis and characterization of Bi-doped zirconia for solid electrolyte

Sood¹,

Singh

Pandey

2010

Ionics

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100-x)ZrO 2 (x)Bi 2 O 3 (x=5, 10, 15) system has been synthesized by solid-state reaction technique. Tetragonal Bi 7.38 Zr 0.62 O 12.31 phase has formed in all the samples after sintering at 850°C for 24 h. Apart from this, ZrO 2 and Bi 2 O 3 are also identified as minority phases. The volume fraction of Bi 7.38 Zr 0.62 O 12.31 phase increases with increasing concentration of Bi 2 O 3 . The AC conductivity plots exhibit phase transition at 570°C and 460°C for x=10 and x=15 samples, respectively. The maximum conductivity is observed (1.60 mS/cm) in x=15 sample. These results are correlated and supported with microstructural and thermal analysis.

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Section: Resultssupporting

confidence: 95%

Synthesis and characterization of Bi-doped zirconia for solid electrolyte

Sood¹,

Singh

Pandey

2010

Ionics

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“…A similar phenomenon was reported for Y 2 O 3doped ZrO 2 . 17,19 In Fig. 4, measured grain size after 1 h of sintering is plotted against sintering temperature.…”

Section: May 2002mentioning

confidence: 99%

Suppression of Rhombohedral‐Phase Appearance and Low‐Temperature Sintering of Scandia‐Doped Cubic‐Zirconia

Hirano

Oda

Ukai

et al. 2002

Journal of the American Ceramic Society

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Inhibition of cubic-rhombohedral phase transformation and low-temperature sintering at 1000°C were achieved for 10-mol%-Sc 2 O 3 -doped cubic-ZrO 2 by the presence of 1 mol% Bi 2 O 3 . The powders of 1-mol%-Bi 2 O 3 -10-mol%-Sc 2 O 3 -doped ZrO 2 were prepared using a hydrolysis and homogeneous precipitation technique. No trace of rhombohedral-ZrO 2 phase could be detected, even after sintering at 1000°-1400°C. The average grain size of the ZrO 2 sintered at 1200°C was >2 m because of grain growth in the presence of Bi 3؉ . Cubic, stabilized Bi-Sc-doped ZrO 2 sintered at 1200°C had sufficient conductivity at 1000°C (0.33 S/cm) to be used as an electrolyte for a solid-oxide fuel cell (SOFC) and at 800°C (0.12 S/cm) for an intermediate-temperature SOFC.

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“…4) It was shown that the boundaries were enriched with Bi, causing a negligible decrease in conductivity and activation energy for ion mobility. Kim and Kim did a systematic study of the effect of phases at a fixed sintering temperature and time, and showed that, consistently with the phase diagram, 5) the cubic-phase stability was affected by the addition of Bi. 3) Monoclinic and tetragonal phases could be formed during densification likely due to the formation of BiY compounds, affecting the intragranular (bulk) conductivity, while the grain boundary conductivity was dependent on the formation of the second phases, and increased with Bi doping.…”

Section: Introductionmentioning

confidence: 86%

“…3),4) Among them, Bi 2 O 3 has been extensively studied but with conflicting results reported in the literature. 5) While densification is clearly enhanced with addition of the dopant, the impacts in the ionic conductivity are not straight forward as it depends much on the synthesis methods and the processing of the powder and sintering conditions. 4), 5) An unfinished ZrO 2 Y 2 O 3 Bi 2 O 3 ternary phase diagram has been proposed for the system at 900°C.…”

Section: Introductionmentioning

confidence: 99%

“…5) While densification is clearly enhanced with addition of the dopant, the impacts in the ionic conductivity are not straight forward as it depends much on the synthesis methods and the processing of the powder and sintering conditions. 4), 5) An unfinished ZrO 2 Y 2 O 3 Bi 2 O 3 ternary phase diagram has been proposed for the system at 900°C. 6) The diagram is consistent, at least qualitatively, with several results in the literature pointing out the effect of monoclinic phase and residual solidified liquid phase in the conductivity properties of YSZ.…”

Section: Introductionmentioning

confidence: 99%

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Fast firing of bismuth doped yttria-stabilized zirconia for enhanced densification and ionic conductivity

Li¹,

Kon²,

Chang³

et al. 2016

J. Ceram. Soc. Japan

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Highly homogeneous bismuth doped cubic-YSZ was prepared using reverse-strike co-precipitation from nitrates. The dopant reduced the sintering temperature for effective fabrication of fully dense pellets within 5 min using fast firing procedure at 1300°C. Delta-Bi 2 O 3 second phase was observed at the boundaries and caused enhancement of grain boundary conductivity, while decreasing activation energy for bulk transport. Longer sintering times (up to 4 h) lead to grain boundary cleaning by evaporation of the Bi phase, consequently reducing the grain boundary conductivity and making the bulk transport activation energy similar to undoped YSZ. No changes in polymorphism were observed during the various processing steps, and only cubic polymorph existed. The findings are expected to have positive impacts on the strategies for manufacturing of more efficient solid oxide fuel cells (SOFC).

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The effect of Bi2O3 on the microstructure and electrical conductivity of ZrO2-Y2O3 ceramics

Cited by 10 publications

References 17 publications

Synthesis and characterization of Bi-doped zirconia for solid electrolyte

Synthesis and characterization of Bi-doped zirconia for solid electrolyte

Suppression of Rhombohedral‐Phase Appearance and Low‐Temperature Sintering of Scandia‐Doped Cubic‐Zirconia

Fast firing of bismuth doped yttria-stabilized zirconia for enhanced densification and ionic conductivity

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