Electrical conductivity of yttria-stabilized zirconia single crystals

Ikeda, Sotomitsu; Sakurai, Osamu; Uematsu, Keizo; Mizutani, Nobuyasu; Kato, Masanori

doi:10.1007/bf00559349

Cited by 124 publications

(66 citation statements)

References 21 publications

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“…Arrhenius equation described ionic conductivity of NdHoSZ with migration barrier of 0.63-1.23 eV. These values were reasonably comparable with the values found by Tas et al [14], Ikeda et al [27], and Devanathan et al [44].…”

Section: Original Research Papersupporting

confidence: 88%

“…It is well known that oxygen ionic conductivity of FTO structure depends on the content of dopant; for instance, a maximum is observed around 8 mol.% yttria in the case of YSZ [26,27]. This behavior is closely related to the trapping of oxygen vacancies in certain lattice sites [28][29][30] , compensates for the additional charges introduced by aliovalent doping.…”

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confidence: 95%

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Molecular Dynamics Study of Complex Dopant Electrolyte Nd_2–_xHo_xZr₂O₇: Structure, Conductivity, and Thermal Expansion

2013

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Nd2–xHoxZr2O7 is an ionic conductor for solid oxide fuel cell electrolytes. Temperature and dopant composition are two main factors that affect ionic conductivity of these groups of materials. Accordingly, Nd2–xHoxZr2O7 was studied in a wide range of temperature, 1,173–1,873 K, and dopant composition, x = 0.0–2.0, by molecular dynamics simulation. Arrhenius plots of ionic conductivity in region of low temperature declared that the maximum occurred at composition x = 0.6 (H6). Surprisingly, it was observed that complexity of dopant improved ionic conductivity of the electrolyte. Moreover, radial distribution function confirmed this result. Two types of anions were observed in the electrolyte, which were dynamic oxygen ions (DOIs) and static oxygen ions (SOIs). Mean square displacement (MSD) of DOIs was higher than SOIs and enhanced oxygen ionic conductivity. Migration barrier of Nd2–xHoxZr2O7 varied from 0.68 to 1.22 eV that was in the range of a good solid oxide electrolyte. Nd1.2Gd0.8Zr2O7 (G8) and Y0.2Zr0.9O2.1 (Y2) were simulated and their results of simulations were compared with H6. Order of ionic conductivity at low temperatures was H6 > Y2 > G8. Another important factor of electrolyte is thermal expansion. Thermal expansion of Nd2–xHoxZr2O7 was around a constant value in the studied temperature range.

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Section: Original Research Papersupporting

confidence: 88%

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confidence: 95%

Molecular Dynamics Study of Complex Dopant Electrolyte Nd_2–_xHo_xZr₂O₇: Structure, Conductivity, and Thermal Expansion

2013

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“…A 1.5 mm thick membrane made from SrCoO 3−δ oxide with the cubic lattice structure demonstrated an ultrahigh oxygen permeation flux of 2.0 ml/cm 2 min [STP] under an air/helium oxygen partial pressure gradient at 950 • C, which is higher than the permeation fluxes of SrCo 0.8 Fe 0.2 O 3−δ [16] and Ba 0.5 Sr 0.5 Co 0.8 Fe 0.2 O 3−δ [17] membranes under similar conditions, the two materials with the highest reported oxygen permeability. The derived oxygen ionic conductivity of the cubic phase SrCoO 3 which is several orders of magnitude higher than the typical high oxygen ionic conducting electrolyte of yttrium stabilized zirconia [18]. For the other phases of SrCoO 3−δ , the conductivity was substantially lower.…”

Section: Introductionmentioning

confidence: 95%

Efficient stabilization of cubic perovskite SrCoO3−δ by B-site low concentration scandium doping combined with sol–gel synthesis

Zeng

Ran

Chen

et al. 2008

Journal of Alloys and Compounds

140

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“…The ionic conductivity of YSZ also depends on the fabrication method [73], sintering temperature [74], and grain size of the polycrystalline materials [75]. The oxygen ionic conductivity of YSZ can be further improved by growing as single crystal or nanocrystalline materials [76][77][78].…”

Section: Zirconia-based Thin Film Electrolytesmentioning

confidence: 98%

State-of-the-Art Thin Film Electrolytes for Solid Oxide Fuel Cells

Nandasiri

Thevuthasan

2015

Thin Film Structures in Energy Applications

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State-of-the-art solid oxide fuel cells (SOFC) are among the main candidates for clean energy technology due to their high efficiency, fuel flexibility, low air pollution, and minimal greenhouse gas emission. However, high operational temperature of SOFC is a greater challenge in commercialization of these devices for low cost and portable applications. High temperature operation of SOFC degrades its performance with aging, limits the selection of materials for fuel cell components, and increases the fabrication cost. Thus, there have been enormous efforts to improve the properties of existing materials and develop new materials for SOFC components in order to lower the operating temperature of SOFC. Recent advances in thin film technology have also been utilized to develop new materials with improved properties for SOFC. One of the key components in SOFC is the electrolyte and several research groups are working on developing new electrolyte materials. In this chapter, we will discuss the recent advances in thin film SOFC electrolytes. This extensive discussion includes the evolution of doped ceria, doped zirconia, and multilayer hetero-structured thin film electrolytes. The newly developed nanoscale thin films and multilayer hetero-structures with improved oxygen ionic conductivity will have significant impact on SOFC devices. Introduction Background of Solid Oxide Fuel Cells (SOFC)The latest U.S. energy reviews revealed that more than 80 % of the energy consumed in the world is still produced by non-renewable energy sources such as petroleum, natural gas, and coal [1]. Moreover, it is projected that world energy consumption will grow by 56 % from 2010 to 2040. Therefore, from a long-term energy perspective, clean energy technologies are needed to utilize primary energy

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Electrical conductivity of yttria-stabilized zirconia single crystals

Cited by 124 publications

References 21 publications

Molecular Dynamics Study of Complex Dopant Electrolyte Nd_2–_xHo_xZr₂O₇: Structure, Conductivity, and Thermal Expansion

Molecular Dynamics Study of Complex Dopant Electrolyte Nd_2–_xHo_xZr₂O₇: Structure, Conductivity, and Thermal Expansion

Efficient stabilization of cubic perovskite SrCoO3−δ by B-site low concentration scandium doping combined with sol–gel synthesis

State-of-the-Art Thin Film Electrolytes for Solid Oxide Fuel Cells

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Electrical conductivity of yttria-stabilized zirconia single crystals

Cited by 124 publications

References 21 publications

Molecular Dynamics Study of Complex Dopant Electrolyte Nd2–xHoxZr2O7: Structure, Conductivity, and Thermal Expansion

Molecular Dynamics Study of Complex Dopant Electrolyte Nd2–xHoxZr2O7: Structure, Conductivity, and Thermal Expansion

Efficient stabilization of cubic perovskite SrCoO3−δ by B-site low concentration scandium doping combined with sol–gel synthesis

State-of-the-Art Thin Film Electrolytes for Solid Oxide Fuel Cells

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Product

Resources

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Molecular Dynamics Study of Complex Dopant Electrolyte Nd_2–_xHo_xZr₂O₇: Structure, Conductivity, and Thermal Expansion

Molecular Dynamics Study of Complex Dopant Electrolyte Nd_2–_xHo_xZr₂O₇: Structure, Conductivity, and Thermal Expansion