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Thermal Variation o...
Thermal Variation of Structure and Electrical Conductivity in Bi4YbO7.5
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- Leszczynska, M. (författare)
- Politechnika Warszawska,Warsaw University of Technology
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- Liu, X. (författare)
- Queen Mary University of London
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- Wrobel, W. (författare)
- Politechnika Warszawska,Warsaw University of Technology
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- Malys, M. (författare)
- Politechnika Warszawska,Warsaw University of Technology
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- Krynski, M. (författare)
- Politechnika Warszawska,Warsaw University of Technology
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- Norberg, Stefan, 1972 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Hull, S. (författare)
- STFC Rutherford Appleton Laboratory
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- Krok, F. (författare)
- Politechnika Warszawska,Warsaw University of Technology
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- Abrahams, I. (författare)
- Queen Mary University of London
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(creator_code:org_t)
- 2013-01-18
- 2013
- Engelska.
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Ingår i: Chemistry of Materials. - : American Chemical Society (ACS). - 1520-5002 .- 0897-4756. ; 25:3, s. 326-336
- Relaterad länk:
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http://dx.doi.org/10...
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https://doi.org/10.1...
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https://research.cha...
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Abstract
Ämnesord
Stäng
- The thermal behavior of the oxide ion-conducting solid electrolyte Bi4YbO7.5 was investigated using a combination of variable temperature X-ray and neutron powder diffraction, thermal analysis (DTA and TGA), and ac impedance spectroscopy. The title compound shows a fluorite-type structure throughout the measured temperature range (20-850 degrees C), with a phase separation at ca. 600 degrees C into a cubic delta-type phase and an orthorhombic phase of assumed stoichiometry Bi17Yb7O36. This type of transition is a relatively common feature in bismuth oxide-based systems and can limit their practical application. Here, the transition was carefully studied using isothermal measurements, which showed that it is accompanied by changes in oxide-ion stoichiometry, as well as significant disorder in the oxide ion sublattice in the delta-type phase. These results correlate with the observed electrical behavior. Analysis of the total neutron scattering through reverse Monte Carlo (RMC) modeling reveals details of the coordination environments for both cations. The oxide-ion vacancy distribution seems to be consistent with a favoring of vacancy pairs, although vacancy pairs exhibit the highest frequency as they have the maximum likelihood. A vacancy ordering model based on three vacancies per cell is presented.
Ämnesord
- NATURVETENSKAP -- Kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences (hsv//eng)
Nyckelord
- system
- neutron diffraction
- diffraction
- defect structure
- cubic bismuth oxides
- fluorite structure
- ionic-conductivity
- fuel-cells
- bismuth ytterbium oxide
- total
- bismuth oxide
- phase
- defect structure
- electrolytes
- solid
- total scattering
- delta-bi2o3
Publikations- och innehållstyp
- art (ämneskategori)
- ref (ämneskategori)
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- Av författaren/redakt...
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Leszczynska, M.
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Liu, X.
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Wrobel, W.
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Malys, M.
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Krynski, M.
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Norberg, Stefan, ...
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visa fler...
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Hull, S.
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Krok, F.
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Abrahams, I.
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visa färre...
- Om ämnet
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- NATURVETENSKAP
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NATURVETENSKAP
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och Kemi
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Chemistry of Mat ...
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Chalmers tekniska högskola