Sauerstoffionenleitende Festelektrolyte und ihre Anwendungsmöglichkeiten; Zusammensetzung und Systematik der Festelektrolyte mit Sauerstoffionenleitung

Möbius, H.‐H.

doi:10.1002/zfch.19640040302

Cited by 49 publications

(4 citation statements)

References 52 publications

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“…On the other hand, in the case of ScSZ, cation–vacancy interaction is not as dominant due to the similarity in cationic sizes between Sc 3+ and Zr 4+ (cf. r Zr = 0.79 Å, r Sc = 0.81 Å) . This may not dramatically impede the migration of oxygen ions.…”

Section: Resultsmentioning

confidence: 99%

“…r Zr = 0.79 Å, r Sc = 0.81 Å). 16 This may not dramatically impede the migration of oxygen ions. However, given that ScSZ is sensitive to the polymorphic phase transition with increasing dopant concentration, oxygen trapping at certain lattice sites may occur, which is commonly found in zirconia-based ceramics.…”

Section: Methodsmentioning

confidence: 99%

“…The ionic conductivity of ScSZ (reported as 0.30 S/cm) is higher than that of YSZ (reported 0.13 S/cm) at high operating temperatures (typically 1000 °C). This is most probably due to the close similarity of the ionic radius of Sc 3+ and Zr 4+ (i.e., r Sc 3+ / r Zr 4+ = 1.03) …”

Section: Introductionmentioning

confidence: 94%

“…This is most probably due to the close similarity of the ionic radius of Sc 3+ and Zr 4+ (i.e., r Sc 3+ /r Zr 4+ = 1.03). 16 On the other hand, to improve long-term chemical and mechanical stability and reduce operational cost, it is beneficial to lower the operating temperature of SOFCs from this technical point of view. In this aspect, the utilization of YSZ is not optimal at intermediate temperature.…”

Section: Introductionmentioning

confidence: 99%

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Understanding the Enhancement of Ionic Transport in Heterogeneously Doped Zirconia by Heterointerface Engineering

Kılıç

Soon

2018

J. Phys. Chem. C

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Zirconia-based ceramics have been the most promising oxide electrolyte material with high ionic conductivity for solid oxide fuel cell (SOFC) applications. Even though yttria-stabilized zirconia (YSZ) and scandia-stabilized zirconia (ScSZ) are typically used for the SOFC at high temperatures, their performance is not optimal at operating temperatures with respect to their ionic conductivity and stability. The literature has focused largely on ionic diffusion dynamics in bulk YSZ and ScSZ, whereas their heterogeneously doped alloy and heterolayered superlattices are less investigated. In this work, using molecular dynamics simulations and diffusion dynamics analysis, we examine and consider five main mechanisms that may contribute to the enhancement of the overall ionic conductivity of these doped zirconia, namely, the influence of cation size, concentration, distribution, the crystal orientation and direction, and lastly, the degree of atomic roughness at the interface in the heterolayered structures. Our results support that heterointerface engineering at the atomic scale greatly reduces local lattice distortions (commonly seen in the bulk phases) while inducing an in-plane strain and thus leading to an overall enhancement of the ionic conductivity and stability for SOFC applications.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

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Understanding the Enhancement of Ionic Transport in Heterogeneously Doped Zirconia by Heterointerface Engineering

Kılıç

Soon

2018

J. Phys. Chem. C

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Ceramic Superionic Conductors

Badwal

2006

Materials Science and Technology

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Röntgenographische und dilatometrische Untersuchungen zur Fehlordnung im Strontiumchlorid

Daniel

Nölting

1983

Ber Bunsenges Phys Chem

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Gitterfehlordnung / Kristallstruktur / PhasenumwandlungenSrCI2 cristallizes in the fluorite structure and shows, like all materials with this structure, anomal properties with regard t o thermodynamic as well as to transport phenomena. In a temperature region starting about 200 K below the melting point (1 146 K) a pronounced maximum of cp is found, which ic to be identified with a Schottky anomaly. Most significant are the increasing values of ionic conductivity with rising temperature. They mostly exceed those of a typical ionic melt. The degree of the "molten" anion lattice and the distinct places of the defect ions are not clarified until now. The temperature of transition at the maximum of the expansion coefficient value at T = lo00 K has been determined by dilatometric measurements. The existence of predominant Frenkel-disorder has been demonstrated by comparing X-ray and dilatometric measurements. The ratio of ionic radii relative to the configuration in the fluorite structure has been determined from lattice parameter and the crystal structure.The enthalpy of formation of Frenkel disorder has been calculated from dilatometric measurements to AHf = (248 k 8) kJ mol.

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Sauerstoffionenleitende Festelektrolyte und ihre Anwendungsmöglichkeiten; Zusammensetzung und Systematik der Festelektrolyte mit Sauerstoffionenleitung

Cited by 49 publications

References 52 publications

Understanding the Enhancement of Ionic Transport in Heterogeneously Doped Zirconia by Heterointerface Engineering

Understanding the Enhancement of Ionic Transport in Heterogeneously Doped Zirconia by Heterointerface Engineering

Ceramic Superionic Conductors

Röntgenographische und dilatometrische Untersuchungen zur Fehlordnung im Strontiumchlorid

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