Defect Structure, Ionic Conductivity, and Diffusion in Yttria Stabilized Zirconia and Related Oxide Electrolytes with Fluorite Structure

1986 ◽  
Vol 133 (8) ◽  
pp. 1542-1548 ◽  
Author(s):  
Akio Nakamura ◽  
J. Bruce Wagner
Keyword(s):  
Ionic Conductivity ◽  
Defect Structure ◽  
Fluorite Structure ◽  
Yttria Stabilized Zirconia ◽  
Stabilized Zirconia ◽  
And Diffusion

Defect structure of yttria-stabilized zirconia and its influence on the ionic conductivity at elevated temperatures

1999 ◽  
Vol 59 (22) ◽  
pp. 14202-14219 ◽  
Author(s):  
J. P. Goff ◽  
W. Hayes ◽  
S. Hull ◽  
M. T. Hutchings ◽  
K. N. Clausen
Keyword(s):  
Ionic Conductivity ◽  
Defect Structure ◽  
Elevated Temperatures ◽  
Yttria Stabilized Zirconia ◽  
Stabilized Zirconia

Improvement of Fluorite Structures in M203-CeO2 (M=Sm, La) System Based on a Novel Effective Index

1998 ◽  
Vol 548 ◽  
Author(s):  
Toshiyuki Mori ◽  
Takayasu Ikegami ◽  
Hiroshi Yamamura
Keyword(s):  
Ionic Conductivity ◽  
Solid Solutions ◽  
Ionic Conduction ◽  
Fluorite Structure ◽  
Effective Index ◽  
Yttria Stabilized Zirconia ◽  
Stabilized Zirconia ◽  
Ionic Radii ◽  
Order Of Magnitude ◽  
Oxide Ionic Conductivity

ABSTRACTM2O3-CeO2(M=Sm, La) system is one of the most interesting of fluorite oxides since the oxide ionic conductivity of it is higher than that of yttria-stabilized zirconia. In this study, the effective index for the improvement of ionic conductivity in CeO2 systems was defined using information regarding ionic radii and the level of oxygen vacancies from the perspective of crystallography. It is assumed that the M2O3 CeO2 based oxides approach the ideal fluorite structure for fast ionic conduction when the effective index increases toward 1. A small amount of alkali- or alkali-earth doped M2O3-CeO2 (M=Sm, La) solid solutions were prepared based on this effective index. The oxide ionic conductivity increased with an increase of this effective index. (La0.75Sr0.2Ba0.05)0.175 Ce0.825 O1.89 that had high effective index, showed high oxide ionic conductivity over the order of magnitude in comparison with 8mol% yttria-stabilized zirconia. Moreover, the oxygen partial pressure dependence of oxide ionic conductivity of M2O3-CeO2(M=Sm, La) solid solutions was improved by the increasing effective index. The utility of this effective index, for improvement of the electrical properties in fluorite CeO2 based materials, was investigated.

Characterizations of Synthetic 8mol% YSZ with Comparison to 3mol %YSZ for HT-SOFC

2020 ◽  
Vol 38 (4A) ◽  
pp. 491-500
Author(s):  
Abeer F. Al-Attar ◽  
Saad B. H. Farid ◽  
Fadhil A. Hashim
Keyword(s):  
Ionic Conductivity ◽  
Electrochemical Impedance ◽  
Structural Information ◽  
Impedance Analysis ◽  
High Energy ◽  
Yttria Stabilized Zirconia ◽  
X Ray Diffraction ◽  
Stabilized Zirconia ◽  
Powder Morphology ◽  
X Ray

In this work, Yttria (Y2O3) was successfully doped into tetragonal 3mol% yttria stabilized Zirconia (3YSZ) by high energy-mechanical milling to synthesize 8mol% yttria stabilized Zirconia (8YSZ) used as an electrolyte for high temperature solid oxide fuel cells (HT-SOFC). This work aims to evaluate the densification and ionic conductivity of the sintered electrolytes at 1650°C. The bulk density was measured according to ASTM C373-17. The powder morphology and the microstructure of the sintered electrolytes were analyzed via Field Emission Scanning Electron Microscopy (FESEM). The chemical analysis was obtained with Energy-dispersive X-ray spectroscopy (EDS). Also, X-ray diffraction (XRD) was used to obtain structural information of the starting materials and the sintered electrolytes. The ionic conductivity was obtained through electrochemical impedance spectroscopy (EIS) in the air as a function of temperatures at a frequency range of 100(mHz)-100(kHz). It is found that the 3YSZ has a higher density than the 8YSZ. The impedance analysis showed that the ionic conductivity of the prepared 8YSZ at 800°C is0.906 (S.cm) and it was 0.214(S.cm) of the 3YSZ. Besides, 8YSZ has a lower activation energy 0.774(eV) than that of the 3YSZ 0.901(eV). Thus, the prepared 8YSZ can be nominated as an electrolyte for the HT-SOFC.

scholarly journals Dissolution and diffusion kinetics of yttria-stabilized zirconia into molten silicates

2021 ◽  
Vol 41 (3) ◽  
pp. 1984-1994
Author(s):  
Collin S. Holgate ◽  
Gareth G.E. Seward ◽  
Andrew R. Ericks ◽  
David L. Poerschke ◽  
Carlos G. Levi
Keyword(s):  
Yttria Stabilized Zirconia ◽  
Diffusion Kinetics ◽  
Stabilized Zirconia ◽  
Kinetics Of ◽  
And Diffusion
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