Enhanced Oxide Ion Conductivity in Stabilized δ‐Bi2O3.

Punn, Rita; Feteira, Antônio; Sinclair, Derek C.; Greaves, C.

doi:10.1002/chin.200711008

Cited by 8 publications

(8 citation statements)

References 1 publication

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“…Bismuth oxides and various substituted derivatives have been mined as a rich compositional space within which to find new fast ion conductors, sparked by the extremely high oxygen ionic conductivity values of the cubic δ phase of Bi 2 O 3 , which is not stable at lower temperatures due to transformation to a monoclinic polymorph below 1003 K. 5,6 Of the families of materials that have been explored, including phases resulting from isovalent doping (rare earth Ln 3+ ) [7][8][9][10][11][12] as well as aliovalent doping (such as pentavalent P, V, Nb, and/or Ta), [13][14][15][16][17][18][19][20][21][22] vanadium-substituted bismuth oxides have shown the most promising values of ionic conductivity at relatively lower temperatures. 23,24 These materials often exhibit complex superstructures; understanding the role the V dopant plays in enabling the superionic behaviour of the Bi-O lattice is correspondingly complex, but is nonetheless necessary in elucidating the best way to optimise these materials for device applications.…”

Section: Introductionmentioning

confidence: 99%

Variable-Temperature Multinuclear Solid-State NMR Study of Oxide Ion Dynamics in Fluorite-Type Bismuth Vanadate and Phosphate Solid Electrolytes

Dunstan

Halat²,

Tate³

et al. 2018

Preprint

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In this study, we employ a multinuclear, variable-temperature NMR spectroscopy approach to characterise and measure oxide ionic motion in the V- and P-substituted bismuth oxide materials Bi0.913V0.087O1.587, Bi0.852V0.148O1.648 and Bi0.852P0.148O1.648, previously shown to have excellent ionic conduction properties. Two main 17O NMR resonances are distinguished for each material, corresponding to O in the Bi–O and V–O/P–O sublattices. Using variable-temperature (VT) measurements ranging from room temperature to 923 K, the ionic motion experienced by these different sites has then been characterised, with coalescence of the two environments in the V-substituted materials clearly indicating a conduction mechanism facilitated by exchange between the two sublattices. The lack of this coalescence in the P-substituted material indicates a different mechanism, confirmed by 17O T1 (spin-lattice relaxation) NMR experiments to be driven purely by vacancy motion in the Bi–O sublattice. 51V and 31P VT-NMR experiments show high rates of tetrahedral rotation even at room temperature, increasing with heating. An additional VO4 environment appears in 17O and 51V NMR spectra of the more highly V-substituted Bi0.852V0.148O1.648, which we ascribe to differently distorted VO4 tetrahedral units that disrupt the overall ionic motion, consistent both with linewidth analysis of the 17O VT-NMR spectra and experimental results of Kuang et al. showing a lower oxide ionic conductivity in this material compared to Bi0.913V0.087O1.587 (Chem. Mater. 2012, 24, 2162). This study shows solid-state NMR is particularly well suited to understanding connections between local structural features and ionic mobility, and can quantify the evolution of oxide-ion dynamics with increasing temperature.

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Section: Introductionmentioning

confidence: 99%

Variable-Temperature Multinuclear Solid-State NMR Study of Oxide Ion Dynamics in Fluorite-Type Bismuth Vanadate and Phosphate Solid Electrolytes

Dunstan

Halat²,

Tate³

et al. 2018

Preprint

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“…Introducing small amount of sintering aids to GDC is one effective way to lower its sintering temperature. Bismuth oxide is the preferred dopant for GDC due to its low binding energy of Bi-O bond with only 102.5 kJ mol À1 [14] and low melting point of 821 C [15]. Gil et al [16][17][18] found that the sintering temperature of GDC was reduced by about 250-300 C with the addition of Bi 2 O 3 .…”

Section: Introductionmentioning

confidence: 98%

Densification Behavior and Space Charge Blocking Effect of Bi2O3 and Gd2O3 Co-doped CeO2 as Electrolyte for Solid Oxide Fuel Cells

Guan

et al. 2015

Electrochimica Acta

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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: 98%

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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Enhanced Oxide Ion Conductivity in Stabilized δ‐Bi₂O₃.

Cited by 8 publications

References 1 publication

Variable-Temperature Multinuclear Solid-State NMR Study of Oxide Ion Dynamics in Fluorite-Type Bismuth Vanadate and Phosphate Solid Electrolytes

Variable-Temperature Multinuclear Solid-State NMR Study of Oxide Ion Dynamics in Fluorite-Type Bismuth Vanadate and Phosphate Solid Electrolytes

Densification Behavior and Space Charge Blocking Effect of Bi2O3 and Gd2O3 Co-doped CeO2 as Electrolyte for Solid Oxide Fuel Cells

Current limiting and negative differential resistance in indium oxide based ceramics

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