High Oxygen Ion Conduction in Sintered Oxides of the Bi2 O 3 ‐ Dy2 O 3 System

Verkerk, M.J.; Burggraaf, A.J.

doi:10.1149/1.2127391

Cited by 158 publications

(85 citation statements)

References 20 publications

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“…1 the samples containing 25.0-35.0 mole% Dy203 show a bend in the Arrhenius plot at a certain temperature 7", of ~870 K. This bend is also reported for Bi203 stabilized with other lanthanides [1, .3--5]. From our work [1,2] and published data [3,4] we searched for relationships between the activation energy, log o'0 and the lanthanide content. For reasons of clarity the data are separately given for temperatures below 820 K and above 9(10 K. The results are given in figs.…”

Section: Conductivity Mechanismmentioning

confidence: 63%

“…Above and below this value, higher concentrations of lanthanide are necessary to stabilize the fcc phase. The shape of the curve can be qualitatively explained [2].…”

Section: (B ) the Influence Of The Lanthanide Content On The Conductimentioning

confidence: 98%

“…The conductivity of the 6-phase (fcc), which exists between 1002 K and the melting point at 1097 K, is mainly ionic. The region of the highly ionic conductive phase can be extended to room temperature by introduction of lanthanides [1][2][3][4][5].…”

Section: Introduction 2 Experimentalmentioning

confidence: 99%

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High oxygen ion conduction in sintered oxides of the Bi2O3Ln2O3 system

Verkerk

Burggraaf

1981

Solid State Ionics

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Section: Conductivity Mechanismmentioning

confidence: 63%

“…Above and below this value, higher concentrations of lanthanide are necessary to stabilize the fcc phase. The shape of the curve can be qualitatively explained [2].…”

Section: (B ) the Influence Of The Lanthanide Content On The Conductimentioning

confidence: 98%

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High oxygen ion conduction in sintered oxides of the Bi2O3Ln2O3 system

Verkerk

Burggraaf

1981

Solid State Ionics

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“…In this presentation the temperature and pressure dependence of the surface oxygen exchange rate is presented of (BieO3)o.75(Er203)0.25 (abbreviated BE25), which is a pure ionic conductor with a very high conductivity [ 7 ], and of (Bi203)o6 (Tb203)~4 (abbreviated BT40), which is a mixed conducting oxide, also with high ionic and electronic (p-type) conductivities [8]. For BE25 a comparison is made with the exchange current values obtained from electrode polarization (I-V) experiments [ 9 ].…”

Section: Introductionmentioning

confidence: 99%

Surface oxygen exchange properties of bismuth oxide-based solid electrolytes and electrode materials

et al. 1989

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The surface oxygen exchange coefficient, ks, has been measured for the solid solution (Bi203)o75(ErzO3)~25 and (Bi203)o 6 (Yb203)o 4 (abbreviated BE25 and BT40), using gas-phase ~80 exchange techniques. The activation enthalpy of ks amounts to AE= 110 kJ/mol for BT40 and AE= 130 kJ/mol for BE25. The magnitude ofk~ for the purely ionic conducting BE25 is comparable with values obtained from electrode polarization (I-V) measurements (AE= 140 kJ/mol). The comparatively high k~ values show a (P~,)" dependence on oxygen pressure with values ofn close to 0.5, indicating surface control in the oxygen transport process. Bismuth oxide containing solid solutions show a large activity in the oxygen exchange reaction with the gas phase.

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“…It was found that 8D4GSB has mainly cubic phase (89.4%) with minor rhombohedral phase (10.6%), while 6D6G and 4D8G exhibit large amounts of rhombohedral phase (68. 8 Intensity (arb. unit) Figure 1.…”

Section: Resultsmentioning

confidence: 99%

Dysprosium and Gadolinium Double Doped Bismuth Oxide Electrolytes for Low Temperature Solid Oxide Fuel Cells

Jung

Lee

Wachsman

2016

J. Electrochem. Soc.

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Herein, we developed a novel double dopant bismuth oxide electrolyte system with dysprosium (Dy) and gadolinium (Gd). The effect of the co-dopants on phase stability and electrical properties was investigated. Phase transformation from cubic to rhombohedral was observed as Gd dopant concentration increased and consequently resulted in conductivity degradation. The stabilization of high temperature cubic phase was achieved with a total dopant concentration as low as ∼12 mol% with 8 mol% Dy and 4 mol% Gd double dopant composition (8D4GSB) and this composition showed one of the highest total conductivity reported at this low temperature regime. In addition, the long-term stability of DGSB electrolytes was investigated. © The Author(s) 2016. Published by ECS. This is an open access article distributed under the terms of the Creative Commons Attribution Non-Commercial No Derivatives 4.0 License (CC BY-NC-ND, http://creativecommons.org/licenses/by-nc-nd/4.0/), which permits non-commercial reuse, distribution, and reproduction in any medium, provided the original work is not changed in any way and is properly cited. For permission for commercial reuse, please email: oa@electrochem.org. [DOI: 10.1149/2.0951605jes] All rights reserved.Manuscript submitted November 25, 2015; revised manuscript received January 29, 2016. Published February 9, 2016 Over the last two decades, solid oxide fuel cell (SOFC) R&D has been concentrated on lowering the operating temperature (<700• C). It is because the operating temperature reduction can allow us to effectively reduce the system cost and increase the long-term stability of SOFCs.1-3 Among SOFC electrolyte materials, yttria-stabilized zirconia (YSZ) system still remains the most popular choice due to its reasonably high ionic conductivity, especially at high temperature ∼800• C, as well as high chemical and mechanical durability over 10,000 h. 4,5 At reduced operating temperatures, however, the ohmic polarization resistance of YSZ is exponentially increased due to its sluggish oxygen ion transport with the thermally activated nature.2 Moreover, there has been repeatedly reported that YSZ materials show high reactivity with other high performance low temperature (LT)-SOFC components including doped ceria oxide electrolytes (e.g., Gd doped ceria) and cobaltite-based perovskite cathodes such as La 1−x Sr x Co 1−y Fe y O 3−δ or Ba 1−x Sr x Co 1−y Fe y O 3−δ .6 To address the issues of the conventional YSZ electrolytes, alternative superionic conductors with higher conductivities, such as doped ceria or stabilized bismuth oxides, have received attention to allow SOFC operation at reduced temperatures.2 Bismuth oxides in a fluorite structure (δ-Bi 2 O 3 ) have been known for their highest oxygen ion conductivity among any reported SOFC electrolytes. This high ionic conductivity is attributed to their inherent defective structures with the intrinsic oxygen vacancy concentration of 25% as well as high anion mobility.7 However, pure δ-Bi 2 O 3 transforms to monoclinic α-phase on cooling belo...

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High Oxygen Ion Conduction in Sintered Oxides of the Bi2 O 3 ‐ Dy2 O 3 System

Cited by 158 publications

References 20 publications

High oxygen ion conduction in sintered oxides of the Bi2O3Ln2O3 system

High oxygen ion conduction in sintered oxides of the Bi2O3Ln2O3 system

Surface oxygen exchange properties of bismuth oxide-based solid electrolytes and electrode materials

Dysprosium and Gadolinium Double Doped Bismuth Oxide Electrolytes for Low Temperature Solid Oxide Fuel Cells

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