Defect structure and electrical conductivity in the Bi3+xNb0.8W0.2O7.1+3x/2 system

Borowska-Centkowska, A.; Kario, A.; Krok, F.; Abrahams, Isaac; Chan, S.C.M.; Liu, X.; Wróbel, W.; Małys, M.; Hull, S.; Dygas, J.R.; Suard, Emmanuelle

doi:10.1016/j.ssi.2010.09.055

Cited by 7 publications

(5 citation statements)

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“…This is consistent with the limited solubility of WO 3 in the bismuth niobate system reported by Borowska-Centkowska et al., which they attributed to crowding in the oxygen sublattice after introduction of W 6+ . The structural features of well-defined clusters of W 4 O 18 tetrahedra of octahedra and the limited solid solution range of Type II Bi 1– x W x 6+ O 1.5+1.5 x (0.15 < x < 0.19) based on substitution of W onto the fcc site (i.e., positions at corners and face centers, cf.…”

Section: Resultssupporting

confidence: 91%

“…Partial phase diagram for the Bi 2 O 3 –Nb 2 O 5 –W 2 O 6 system. Crosses indicate samples reported in literature , and dots samples of this work. Red indicates samples with cubic fluorite-related structure.…”

Section: Resultsmentioning

confidence: 97%

“…This was the goal of the work reported here. Our approach was based on the fact that M 5+ -doped systems exhibit a modulation parameter slightly larger than 1/3, while modulation parameters in M 6+ -doped systems are lower than 1/3 (see Figure ); that mixed doping has been shown to yield Type II phases in the W 6+ /Nb 5+ system. − We therefore hypothesized that mixed-valence transition metal doping could lead to a truly commensurate Type II phase.…”

Section: Introductionmentioning

confidence: 99%

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Rational Design of a Commensurate (3 + 3)-D Modulated Structure within the Fast-Ion Conducting Stabilized δ-Bi₂O₃ Series

et al. 2017

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We report the systematic design, preparation, and characterization of the first commensurate member of the oxide-ionic conducting, (3 + 3)-D modulated, Type II phases of doped δ-Bi 2 O 3 . The incommensurate Type II modulation vector ε was previously described as continuously variable, but high-resolution synchrotron X-ray powder diffraction data show that close to the composition Bi 23 CrNb 3 O 45 , it "locks in" to ε = 1/3. The space group of the resulting 3 × 3 × 3 fluoritetype supercell was found to be F4̅ 3m by selected-area electron diffraction, and the structure was solved and Rietveld-refined against neutron powder diffraction data in conjunction with local structural information from X-ray absorption spectroscopy, high-resolution transmission electron microscopy, and ab initio geometry optimization calculations. The result unambiguously validates the crystal-chemical model of the Type II phases as being based on the local ordering of oxygen around transition metals M into tetrahedral clusters of MO 6 octahedra and isolated MO 4 tetrahedra, separating relatively disordered fluorite-type regions that facilitate the highest oxide-ionic conduction among transition metal-doped δ-Bi 2 O 3 phases.

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Section: Resultssupporting

confidence: 91%

Section: Resultsmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

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Rational Design of a Commensurate (3 + 3)-D Modulated Structure within the Fast-Ion Conducting Stabilized δ-Bi₂O₃ Series

et al. 2017

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“…4-6, Table 3). The general run of temperature dependences of conductiv ity for the studied solid solutions has the shape typical for the cubic modification of bismuth niobate [8][9][10]. Two linear regions can be distinguished in the depen dences.…”

Section: +mentioning

confidence: 86%

“…Bismuth niobate Bi 3 NbO 7 , according to [8], is an oxygen-ionic conductor; its conductivity is 5 × 10 ⎯4 S/cm at 600°С. Niobate Bi 7 Nb 2 O 15.5 , according to [9], has a significant electronic conductivity at low temperatures (≤600°С).…”

Section: Introductionmentioning

confidence: 99%

Structural and transport characteristics of substituted bismuth niobates

et al. 2013

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Abstract-The results of studying solid solutions with the composition of Bi 3 Nb 1 -y Zr y O 7 ± δ , Bi 2.95 Y 0.05 Nb 1 -y Zr y O 7 ± δ (y = 0-0.5; Δy = 0.1), and Bi 6.95 Y 0.05 Nb 2 -y Zr y O 15.5 (y = 0.1-1; Δy = 0.1) are pre sented. XRD and electron microscopy with X ray microanalysis are used to determine the homogeneity regions of solid solutions; crystallochemical parameters are calculated. It is shown that irrespective of the ratio of Bi : Nb, two cubic phases are formed at an increase in the dopant amount. One of these represents a solid solution based on Bi 3 NbO 7 (δ phase) and the second one is a solid solution based on δ Bi 2 O 3 (δ' phase). Conductivity of sintered samples is studied using the impedance spectroscopy technique. Introduction of yttrium into the bismuth sublattice results in no increase in conductivity of solid solutions, while in the case of the ratio of Bi : Nb = 3 : 1, overall conductivity of solid solutions is somewhat higher at similar dopant con centrations.

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Ionic and electronic conductivity in a Bi2O3-based material

et al. 2012

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Defect structure and electrical conductivity in the Bi3+xNb0.8W0.2O7.1+3x/2 system

Cited by 7 publications

References 20 publications

Rational Design of a Commensurate (3 + 3)-D Modulated Structure within the Fast-Ion Conducting Stabilized δ-Bi₂O₃ Series

Rational Design of a Commensurate (3 + 3)-D Modulated Structure within the Fast-Ion Conducting Stabilized δ-Bi₂O₃ Series

Structural and transport characteristics of substituted bismuth niobates

Ionic and electronic conductivity in a Bi2O3-based material

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Defect structure and electrical conductivity in the Bi3+xNb0.8W0.2O7.1+3x/2 system

Cited by 7 publications

References 20 publications

Rational Design of a Commensurate (3 + 3)-D Modulated Structure within the Fast-Ion Conducting Stabilized δ-Bi2O3 Series

Rational Design of a Commensurate (3 + 3)-D Modulated Structure within the Fast-Ion Conducting Stabilized δ-Bi2O3 Series

Structural and transport characteristics of substituted bismuth niobates

Ionic and electronic conductivity in a Bi2O3-based material

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Product

Resources

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Rational Design of a Commensurate (3 + 3)-D Modulated Structure within the Fast-Ion Conducting Stabilized δ-Bi₂O₃ Series

Rational Design of a Commensurate (3 + 3)-D Modulated Structure within the Fast-Ion Conducting Stabilized δ-Bi₂O₃ Series