Ionic conductivity of Bi2NixV1−xO5.5−3x/2 (0.1 ≤ x ≤ 0.2) oxides prepared by a low temperature sol-gel route

Rusli, Rolan; Abrahams, Isaac; Patah, Aep; Prijamboedi, Bambang; Ismunandar,

doi:10.1063/1.4868777

Cited by 3 publications

(3 citation statements)

References 23 publications

(29 reference statements)

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“…A huge variety of cations have been successfully used as substituents, [16][17][18][19][20][21][22] most notably divalent cations such as Cu 2+ and Ni 2+ where conductivities of 1.0 Â 10 À1 S cm À1 and 1.1 Â 10 À1 S cm À1 , respectively, have been achieved at 600 C for the x ¼ 0.10 compositions. 14,23,24 Interestingly, despite the different valence states of the substituent cations, similar conductivities at 600 C have also been reported in tetravalent (BITIVOX, x ¼ 0.125), 25 trivalent (BIALVOX, x ¼ 0.13), 26 and monovalent (e.g. BIAGVOX and BILIVOX, both x ¼ 0.10) cation substituted systems.…”

Section: Introductionsupporting

confidence: 67%

Local structure in a tetravalent-substituent BIMEVOX system: BIGEVOX

et al. 2022

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Section: Introductionsupporting

confidence: 67%

Local structure in a tetravalent-substituent BIMEVOX system: BIGEVOX

et al. 2022

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“…The γ-type phase is the most interesting polymorph, with excellent oxide-ion conductivities, as high as 0.1 S cm –1 at 600 °C and 10 –3 S cm –1 at 300 °C reported in the Cu 2+ - and Ni 2+ -substituted systems. − This high conductivity is closely associated with high levels of disorder in the vanadate layer. In fact, there are two main γ-type phases, the fully disordered tetragonal γ-phase is usually observed in BIMEVOXes at temperatures above ca.…”

Section: Introductionmentioning

confidence: 99%

Local Structure and Conductivity in the BIGAVOX System

et al. 2022

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While BIMEVOX systems have attracted attention for their fast oxide-ion conductivity at intermediate temperatures, there are only a limited number of reports concerning their local structure. In this work, both long-range and local structures in the Bi2V1–x Ga x O5.5–x–δ (BIGAVOX, 0.025 ≤ x ≤ 0.40) system are investigated using X-ray powder diffraction (XRD) and a combination of X-ray total scattering, 51V and 71Ga solid-state nuclear magnetic resonance (NMR), and Raman spectroscopy, supported by electrical measurements using a.c. impedance spectroscopy. The three main BIMEVOX polymorphs, α, β, and γ, are observed at room temperature over the compositional ranges 0.025 ≤ x < 0.10, 0.10 ≤ x < 0.20, and 0.20 ≤ x < 0.40, respectively. Above x = 0.10, as more Ga is introduced into the lattice, a general growth of the distance between bismuthate and vanadate layers is observed, indicating increasing ionicity in the interaction between these layers. Ga is found to adopt octahedral and tetrahedral geometries, while V polyhedra include tetrahedral, pentacoordinate, and octahedral geometries. With increasing x-value, as the vacancy concentration increases, more octahedral V polyhedra transform to lower coordinate geometries, resulting in a decrease in the average V–O bond length. Reversible α ↔ β and β ↔ γ phase transitions are observed on heating the x = 0.05 composition, while the β ↔ γ and γ′ ↔ γ phase transitions are observed on heating the x = 0.15 and 0.20 compositions, respectively. The γ-BIGAVOX compositions (x = 0.20 and 0.25) generally show a high conductivity of ∼10–2 S cm–1 at 600 °C.

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“…At the high temperature, γ-phase was formed and had a conductivity of 0.2 Scm -1 at 943 K [6]. The γ-Bi2VO5.5 can be stabilized by partial substitution of V 5+ with other metal cations (ME) [8][9]. The substitution does not only stabilize the structure but also increases ionic conductivity due to the creation of vacancies [10][11].…”

Section: ■ Introductionmentioning

confidence: 99%

Highest Ionic Conductivity of BIMEVOX (ME = 10% Cu, 10% Ga, 20% Ta): Computational Modeling and Simulation

et al. 2020

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BIMEVOX had the potential to play an important role in solid oxide fuel cell, especially as the electrolyte due to their high ionic conductivity. In this work, oxide ion migrations of γ-Bi2VO5.5 and BIMEVOX were simulated using density function theory (DFT), Mott-Littleton method, and molecular dynamic simulation. In γ-Bi2VO5.5, there were oxygen vacancies at the equatorial position in the vanadate layers. These vacancies could facilitate oxide ions migration. The Enthalpy of the oxide migration for γ-Bi2VO5.5 based on DFT calculation was 0.38 eV, which was in a good agreement with experimental results. The γ-Bi2VO5.5 can be stabilized by partial substitution of V5+ with Cu2+, Ga3+, and Ta5+. Defect simulation results using the Mott-Littleton method showed that the total maximum energies of region II were achieved at concentrations of 10, 10, and 20%, respectively for Cu2+, Ga3+, and Ta5+. The calculated concentration of Cu2+, Ga3+, and Ta5+ were in a good agreement with those of experiment results, where the highest ionic conductivity obtained. The results of the molecular dynamics simulation showed that the activation energies of oxide ion migration in γ-Bi2VO5.5 and BIMEVOX (ME = Cu and Ta) respectively were 0.19, 0.21, and 0.10 eV, close to experimental values.

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Ionic conductivity of Bi2NixV1−xO5.5−3x/2 (0.1 ≤ x ≤ 0.2) oxides prepared by a low temperature sol-gel route

Cited by 3 publications

References 23 publications

Local structure in a tetravalent-substituent BIMEVOX system: BIGEVOX

Local structure in a tetravalent-substituent BIMEVOX system: BIGEVOX

Local Structure and Conductivity in the BIGAVOX System

Highest Ionic Conductivity of BIMEVOX (ME = 10% Cu, 10% Ga, 20% Ta): Computational Modeling and Simulation

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