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

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

doi:10.1016/0167-2738(81)90133-8

Cited by 61 publications

(24 citation statements)

References 8 publications

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“…Doping with erbia or yttria has shown the best preservation of ionic conductivity. 2 The conductivity of compositions Biz-,(Y,Er),O, have been investigated exten~ively. '-~ In the Biz-$r,O, system, the maximum conductivity is reached at 20 to 25 mole percent (m/o) Er (x = 0.4 to 0.5).…”

Section: Introductionmentioning

confidence: 99%

Oxygen Permeation Properties of Dense Bi1.5Er0.5 O 3 ‐ Ag Cermet Membranes

Elshof

Nguyen

Otter

et al. 1997

J. Electrochem. Soc.

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Oxygen permeation experiments were performed on dense mixed-conducting ceramic-metal composite membranes (thickness 0.2 to 2 mm) Bil,5Ero50,-Ag with 10.0, 27.8, and 40.0 volume percent (v/o) silver, respectively, in the temperature range 873 to 993 K and oxygen partial pressure range to 1 bar 0,. The oxygen fluxes increased with increasing silver content. In the cerinets with a nonpercolative silver phase (10.0 and 27.8 v/o), the increased oxygen flux relative to that of pure Bi,,ErO50, was attributed to faster kinetics of surface oxygen exchange in the presence of silver. Percolativity of the silver phase in the 40 v/o Ag composition enhances the ambipolar diffusion of oxygen ions and electrons. High oxygen fluxes (-0.25 mmol m-2 s-' at 873 K) were observed with the latter composition, which were shown to be fully limited by the surface exchange kinetics. The activation energy for oxygen permeation in the temperature range 848 to 1003 K is about 85 to 95 kJ/mol for the compositions without percolativity of silver and 115 kJ/mol for the composite with 40 V/O Ag, which reflects a change of the rate-limiting step upon passing the percolation threshold. Results from both permeation and isotopic exchange measurements on the composition with Ag percolativity indicated the kinetic order of the surface process in oxygen to be 1/4, indicating a process fundamentally different from that on pure Bi,,Er,,O,.

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Section: Introductionmentioning

confidence: 99%

Oxygen Permeation Properties of Dense Bi1.5Er0.5 O 3 ‐ Ag Cermet Membranes

Elshof

Nguyen

Otter

et al. 1997

J. Electrochem. Soc.

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“…The phase-stabilized bismuth oxides undergo an order-disorder transition of the oxygen sublattice at about 600 °C resulting in a change in conductivity activation energy [27,28]. It has been reported by Wachsman et al that the conductivity of phase-stabilized bismuth oxides decays when annealed at temperatures less than the transition temperature.…”

Section: Neutron Diffraction Study Of Occupancy and Positional Order mentioning

confidence: 99%

“…The neutron diffraction studies of Battle et al [25,26] and Verkerk et al [27,28] performed for the disordered anion sublattice show that the anion sublattice is a combination of the Gattow model (3/4 occupancy at 8c positions) and the Willis model (average occupancy of 32f positions). These studies are consistent with the high ionic conductivity of this material, which is attributed to the disordered nature of the oxygen sublattice above the order-disorder transition temperature.…”

Section: Neutron Diffraction Study Of Occupancy and Positional Order mentioning

confidence: 99%

Stable High Conductivity Bilayered Electrolytes for Low Temperature Solid Oxide Fuel Cells

Wachsman¹,

Duncan²

2002

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A bilayer electrolyte consisting of acceptor-doped ceria (on the fuel/reducing side) and cubicstabilized bismuth oxide (on the oxidizing side) was developed. The bilayer electrolyte that was developed showed significant improvement in open-circuit potential versus a typical ceria based SOFC. Moreover, the OCP of the bilayer cells increased as the thickness of the bismuth oxide layer increased relative to the ceria layer. Thereby, verifying the bilayer concept. Although, because of the absence of a suitable cathode (a problem we are still working assiduously to solve), we were unable to obtain power density curves, our modeling work predicts a reduction in electrolyte area specific resistance of two orders of magnitude over cubic-stabilized zirconia and projects a maximum power density of 9 W/m 2 at 800 °C and 0.09 W/m 2 at 500 °C.Towards the development of the bilayer electrolyte other significant strides were made. Among these were, first, the development of a, bismuth oxide based, oxide ion conductor with the highest conductivity (0.56 S/cm at 800 °C and 0.043 S/cm at 500 °C) known to date. Second, a physical model of the defect transport mechanisms and the driving forces for the ordering phenomena in bismuth oxide and other fluorite systems was developed. Third, a model for point defect transport in oxide mixed ionic-electronic conductors was developed, without the typical assumption of a uniform distribution of ions and including the effect of variable loads on the transport properties of an SOFC (with either a single or bilayer electrolyte).i CONTENTS

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“…This suggests that bismuth oxide addition may also induce non-ohmic behavior in indium oxide ceramics. Moreover, some bismuth oxide phases in such ceramics can have ionic conduction with oxygen ion as a carrier [25][26][27] this can be favourable for the manifestation of the current limiting mechanism proposed by Bondarchuk et al [12].…”

Section: Introductionmentioning

confidence: 99%

Current limiting and negative differential resistance in indium oxide based ceramics

Glot

Mazurik

Jones

et al. 2010

Journal of the European Ceramic Society

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Abstract.Indium oxide based ceramics with bismuth oxide addition were sintered in air in the temperature range 800-1300 ºC. Current-voltage characteristics of In 2 O 3 -Bi 2 O 3 ceramics sintered at different temperatures are weakly nonlinear. After an additional heat treatment in air at about 200 ºC samples sintered at a temperature within the narrow range of about 1050-1100 ºC exhibit a current-limiting effect accompanied by low-frequency current oscillations. It is shown that the observed electrical properties are controlled by the grain-boundary barriers and the heat treatment in air at 200 ºC leads to the decrease in the barrier height. Electrical measurements, scanning electron microscopy and X-ray photoelectron spectroscopy results suggest that the current-limiting effect observed in In 2 O 3 -Bi 2 O 3 may be explained in terms of a modified barrier model; the observed current-limiting effect is the result of an increase of barrier height with increasing electric field, due to additional oxygen absorption. It is found that In 2 O 3 -Bi 2 O 3 -Co 3 O 4 -Cr 2 O 3 ceramic exhibits current-voltage characteristics with negative differential resistance due to Joule micro heating.

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

Cited by 61 publications

References 8 publications

Oxygen Permeation Properties of Dense Bi1.5Er0.5 O 3 ‐ Ag Cermet Membranes

Oxygen Permeation Properties of Dense Bi1.5Er0.5 O 3 ‐ Ag Cermet Membranes

Stable High Conductivity Bilayered Electrolytes for Low Temperature Solid Oxide Fuel Cells

Current limiting and negative differential resistance in indium oxide based ceramics

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