Ionic and electronic conductivity in a Bi2O3-based material

Małys, M.; Dygas, J.R.; Hołdyński, Marcin; Borowska-Centkowska, A.; Wróbel, W.; Marzantowicz, M.

doi:10.1016/j.ssi.2012.03.025

Cited by 13 publications

(12 citation statements)

References 15 publications

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“…The observation of the same qualitative and similar quantitative behavior indicates that indeed the charge dynamics in the temperature range investigated has a strong influence of the oxygen motion in the samples, influence that is decreasing with temperature. A microscopic evidence of the small ionic conductivity in α‐Bi 2 O 3 ceramic samples has been found by oxygen tracer diffusion measurements, while mixed electronic and ionic conductivities have been observed in other Bi 2 O 3 ‐based materials …”

Section: Resultsmentioning

confidence: 92%

“…A microscopic evidence of the small ionic conductivity in α-Bi 2 O 3 ceramic samples has been found by oxygen tracer diffusion measurements, [32] while mixed electronic and ionic conductivities have been observed in other Bi 2 O 3 -based materials. [33] We have performed XAS to investigate the differences in the local order of nanowires and the ceramic sample that may explain the different behaviors when cooling the samples from the cubic δ phase. Figure 5 shows room temperature XANES spectra of α-Bi 2 O 3 ceramic and nanowires samples.…”

Section: Resultsmentioning

confidence: 99%

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Correlation of Electrical Response and Structural Phase Transitions in Bi₂O₃ Nanowires

Vila

Rivera-Calzada

Salas‐Colera

et al. 2018

Physica Status Solidi (a)

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The electric response of Bi2O3 nanowires is studied by means of impedance spectroscopy at high temperatures and compared to a reference bulk Bi2O3 ceramic. Nanowires present the α to δ phase transition at a similar temperature than the ceramic (1007 vs. 1010 K), showing an increase of over two orders of magnitude in the conductance. On cooling, nanowires change directly to the α phase instead of presenting metastable phases, like the bulk sample. Both samples present a dominant ionic contribution in the δ phase which is also present in the α phase at the highest temperatures. X‐ray absorption spectroscopy (XAS) measurements reveal no differences in the short range structural order of both kinds of samples at room temperature, while a detailed analysis by high temperature X‐ray diffraction (HTXRD) confirms the transitions observed in the conductance measurements. The authors relate the direct phase transition δ → α in nanowires to a lower thermal conductivity in these nanostructures.

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Section: Resultsmentioning

confidence: 92%

Section: Resultsmentioning

confidence: 99%

Correlation of Electrical Response and Structural Phase Transitions in Bi₂O₃ Nanowires

Vila

Rivera-Calzada

Salas‐Colera

et al. 2018

Physica Status Solidi (a)

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“…It should be noted, that the applied method of transference number determination, based on EMF measurements under an oxygen partial pressure gradient, is limited to temperatures between ca. 450 and 850 °C [23]. Fig.…”

Section: Transference Number Measurementsmentioning

confidence: 93%

“…The ionic and electronic contributions to the total conductivity were measured using a modified EMF method, with an external adjustable voltage source in the concentration cell O 2 (pO 2 = 1.01 × 10 5 Pa): Pt | sample | Pt : O 2 (pO 2 = 0.2095 × 10 5 Pa), as described in detail elsewhere [23]. Measurements were performed on cooling between ca.…”

Section: Electrical Measurementsmentioning

confidence: 99%

Structural and electrical properties of Bi 3 Y 0.9 W 0.1 O 6.15 -La 0.8 Sr 0.2 MnO 3 (BiYWO-LSM) composites

et al. 2017

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Electrical conductivity and structural behavior in Bi 3 Y 0.9 W 0.1 O 6.15-La 0.8 Sr 0.2 MnO 3 (BiYWO-LSM) composite cathodes for intermediate temperature solid-oxide fuel cells (IT-SOFCs) have been investigated. The ionically conducting component (BiYWO) was selected as it not only exhibits high oxide ion conductivity at intermediate temperatures, but also shows good long-term stability. The LSM component is a well-known electronic conductor, commonly used for SOFC cathodes and also shows high interfacial polarization effects. Both composite components exhibit similar thermal expansion coefficients. Composites of different molar ratios of components were prepared by sintering the components together at 850 °C. Electrical behavior was studied by a.c. impedance spectroscopy and transference number measurements were used to determine the ionic and electronic contributions to total conductivity. Percolation type behavior was observed for total conductivity and the percolation threshold value was determined to be in the bismuth rich region of the compositional range, due to the significant difference in the grain sizes of the two components. Ionic and electronic components of the total conductivity at, above and below the percolation threshold are discussed. Stability measurements on a composition close to the percolation threshold show some degree of conductivity decay on prolonged annealing at 650 °C, which is partly recoverable on heating to higher temperatures.

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“…43 Transference numbers were measured using a modified EMF method, with an external adjustable voltage source in the concentration cell O 2 (pO 2 = 1.01 × 10 5 Pa): Pt | oxide | Pt : O 2 (pO 2 = 0.2095 × 10 5 Pa) as described in detail elsewhere. 44 Cylindrical pellets of ca. 15 mm diameter and ca.…”

Section: Electrical Measurementsmentioning

confidence: 99%

Oxide ion distribution, vacancy ordering and electrical behaviour in the Bi₃NbO₇–Bi₃YbO₆pseudo-binary system

et al. 2014

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Oxide ion distribution, vacancy ordering and electrical conductivity has been examined in the Nb/Yb double substituted bismuth oxide based system Bi 3 Nb 1-x Yb x O 7-x , using X-ray and neutron powder diffraction, reverse Monte Carlo modelling of total neutron scattering data and a.c. impedance spectroscopy. Transference number measurements confirm the system to be predominantly ionically conducting above ca. 450°C. Niobium rich compositions show incommensurate ordering of the fluorite subcell, while increasing ytterbium content results in a commensurate fluorite, with fully disordered cation and anion sublattices. Oxide ion distribution shows both compositional and thermal dependencies. The latter is discussed with respect to its effect on the thermal variation of cubic lattice parameter. Substitution of bismuth by niobium and ytterbium in the cation sublattice of bismuth oxide leads to the creation of Frenkel interstitial oxide ions, which increase the tetrahedral vacancy concentration. The high vacancy concentration is confirmed in both Rietveld and RMC analyses of neutron data. Examination of vacancy ordering, in the x = 0.6 composition, indicates a favouring of <100> vacancy pair alignment.

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Ionic and electronic conductivity in a Bi2O3-based material

Cited by 13 publications

References 15 publications

Correlation of Electrical Response and Structural Phase Transitions in Bi₂O₃ Nanowires

Correlation of Electrical Response and Structural Phase Transitions in Bi₂O₃ Nanowires

Structural and electrical properties of Bi 3 Y 0.9 W 0.1 O 6.15 -La 0.8 Sr 0.2 MnO 3 (BiYWO-LSM) composites

Oxide ion distribution, vacancy ordering and electrical behaviour in the Bi₃NbO₇–Bi₃YbO₆pseudo-binary system

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Ionic and electronic conductivity in a Bi2O3-based material

Cited by 13 publications

References 15 publications

Correlation of Electrical Response and Structural Phase Transitions in Bi2O3 Nanowires

Correlation of Electrical Response and Structural Phase Transitions in Bi2O3 Nanowires

Structural and electrical properties of Bi 3 Y 0.9 W 0.1 O 6.15 -La 0.8 Sr 0.2 MnO 3 (BiYWO-LSM) composites

Oxide ion distribution, vacancy ordering and electrical behaviour in the Bi3NbO7–Bi3YbO6pseudo-binary system

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Correlation of Electrical Response and Structural Phase Transitions in Bi₂O₃ Nanowires

Correlation of Electrical Response and Structural Phase Transitions in Bi₂O₃ Nanowires

Oxide ion distribution, vacancy ordering and electrical behaviour in the Bi₃NbO₇–Bi₃YbO₆pseudo-binary system