Electrical and Ionic Conductivity of Gd-Doped Ceria

2000 ◽  
Vol 147 (10) ◽  
pp. 3606 ◽  
Author(s):  
Shaorong Wang ◽  
Takehisa Kobayashi ◽  
Masayuki Dokiya ◽  
Takuya Hashimoto
Keyword(s):  
Ionic Conductivity ◽  
Doped Ceria

scholarly journals High Pressure X-ray Diffraction as a Tool for Designing Doped Ceria Thin Films Electrolytes

Coatings ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 724
Author(s):  
Sara Massardo ◽  
Alessandro Cingolani ◽  
Cristina Artini
Keyword(s):  
Thin Films ◽  
High Pressure ◽  
Rare Earth ◽  
Ionic Conductivity ◽  
Bulk Material ◽  
Threshold Temperature ◽  
Doped Ceria ◽  
X Ray Diffraction ◽  
X Ray ◽  
Rare Earth Doped

Rare earth-doped ceria thin films are currently thoroughly studied to be used in miniaturized solid oxide cells, memristive devices and gas sensors. The employment in such different application fields derives from the most remarkable property of this material, namely ionic conductivity, occurring through the mobility of oxygen ions above a certain threshold temperature. This feature is in turn limited by the association of defects, which hinders the movement of ions through the lattice. In addition to these issues, ionic conductivity in thin films is dominated by the presence of the film/substrate interface, where a strain can arise as a consequence of lattice mismatch. A tensile strain, in particular, when not released through the occurrence of dislocations, enhances ionic conduction through the reduction of activation energy. Within this complex framework, high pressure X-ray diffraction investigations performed on the bulk material are of great help in estimating the bulk modulus of the material, and hence its compressibility, namely its tolerance toward the application of a compressive/tensile stress. In this review, an overview is given about the correlation between structure and transport properties in rare earth-doped ceria films, and the role of high pressure X-ray diffraction studies in the selection of the most proper compositions for the design of thin films.

Ionic conductivity in nanocrystalline Gd doped ceria

2008 ◽  
Vol 1122 ◽  
Author(s):  
Gianguido Baldinozzi ◽  
David Simeone ◽  
Dominique Gosset ◽  
Mickael Dollé ◽  
Georgette Petot-Ervas
Keyword(s):  
Grain Size ◽  
Ionic Conductivity ◽  
Sol Gel ◽  
Doped Ceria ◽  
Narrow Size Distribution ◽  
Conductivity Measurements ◽  
X Ray Diffraction ◽  
X Ray ◽  
Grain Sizes ◽  
The Impact

AbstractWe have synthesized Gd-doped ceria polycrystalline samples (5, 10, 15 %mol), having relative densities exceeding 95% and grain sizes between 30 and 160 nm after axial hot pressing (750 °C, 250 MPa). The samples were prepared by sintering nanopowders obtained by sol-gel chemistry methods having a very narrow size distribution centered at about 16 nm. SEM and X-ray diffraction were performed to characterize the sample microstructures and to assess their structures. We report ionic conductivity measurements using impedance spectroscopy. It is important to investigate the properties of these systems with sub-micrometric grains and as a function of their composition. Therefore, samples having micrometric and nanometric grain sizes (and different Gd content) were studied. Evidence of Gd segregation near the grain boundaries is given and the impact on the ionic conductivity, as a function of the grain size and Gd composition, is discussed and compared to microcrystalline samples.

Samarium doped ceria (SDC) synthesized by a metal triethanolamine complex decomposition method: Characterization and an ionic conductivity study

2017 ◽  
Vol 43 (13) ◽  
pp. 9823-9830 ◽  
Author(s):  
Worawat Wattanathana ◽  
Chatchai Veranitisagul ◽  
Suttipong Wannapaiboon ◽  
Wantana Klysubun ◽  
Nattamon Koonsaeng ◽  
...  
Keyword(s):  
Ionic Conductivity ◽  
Decomposition Method ◽  
Doped Ceria

Preparation and characterization of Sm and Ca co-doped ceria–La0.6Sr0.4Co0.2Fe0.8O3−δsemiconductor–ionic composites for electrolyte-layer-free fuel cells

2016 ◽  
Vol 4 (40) ◽  
pp. 15426-15436 ◽  
Author(s):  
Baoyuan Wang ◽  
Yi Wang ◽  
Liangdong Fan ◽  
Yixiao Cai ◽  
Chen Xia ◽  
...  
Keyword(s):  
Fuel Cells ◽  
Ionic Conductivity ◽  
Oxygen Enrichment ◽  
Doped Ceria ◽  
Electrolyte Layer ◽  
Conductivity Enhancement ◽  
Co Doped

The oxygen enrichment at the interface leads to ionic conductivity enhancement for LSCF–SCDC composites, thus increasing the output of assembled EFFCs.

Ionic conductivity of Sm, Gd, Dy and Er-doped ceria

2007 ◽  
Vol 171 (2) ◽  
pp. 506-510 ◽  
Author(s):  
Sutin Kuharuangrong
Keyword(s):  
Ionic Conductivity ◽  
Doped Ceria ◽  
Er Doped

Sintering behaviour and ionic conductivity of yttria-doped ceria

1996 ◽  
Vol 16 (9) ◽  
pp. 961-973 ◽  
Author(s):  
Jan Van herle ◽  
Teruhisa Horita ◽  
Tatsuya Kawada ◽  
Natsuko Sakai ◽  
Harumi Yokokawa ◽  
...  
Keyword(s):  
Ionic Conductivity ◽  
Doped Ceria ◽  
Sintering Behaviour ◽  
Yttria Doped Ceria

Some Structural Aspects of Ionic Conductivity in Co-Doped Ceria-Based Electrolytes

2013 ◽  
Vol 58 (4) ◽  
pp. 1355-1359 ◽  
Author(s):  
M. Dudek
Keyword(s):  
Solid Solution ◽  
Chemical Composition ◽  
Ionic Conductivity ◽  
Solid Oxide Fuel Cells ◽  
Solid Solutions ◽  
Transference Number ◽  
Solid Oxide ◽  
Doped Ceria ◽  
Oxide Fuel ◽  
Co Doped

Abstract The sinters of co-doped ceria solid solutions with the formula of Ce0.85Sm0.15-x RxO1.9, where R = Y, Gd, Pr, Tb, Ox-0.15, were obtained from powders synthesised by Pechini method. The linear variation of cell parameter a vs. chemical composition was observed for Ce0.85Sm0:15-xRxO1.9, where R = Y, Gd, Tb, 0 <x<0.15 samples. However, the introduction of Pr3+ into Ce0.85Sm0.15-x PrxO1.9 caused a small deviation from linearity due to possible changes in the valence from Pr3+ to Pr4+. The determined values of oxide transference number tion for Ce0.85Sm0.15-xRxO1.9, R = Y, Gd in the temperature range 400-750°C and partial oxygen pressure from 10-6 to 1 atm were close to 1, which indicated that materials investigated exhibited practically pure ionic oxide conductivity. On the other hand, the introduction of Tb3+ or Pr3+ higher than x>0.05 into solid solution Ce0.85Sm0.15-xRxO1.9, R = Tb, Pr caused a decrease in the ionic transference number tion below 1 due to an increase in partial electronic conduction. This fact limiting investigated co-doped terbia and samaria or samaria and praseodymia ceria-based solid solutions for the further application as oxide electrolytes in solid oxide fuel cells. The analysis of bulk and grain boundary values indicated that partial substitution of Sm3+ by Y3+ or Gd3+ caused slight improvements in the ionic conductivity of Ce0.85Sm0.15-xRxO1.9. The highest ionic conductivity was found for solid solution with chemical composition Ce0.85Sm0.1Y0.05O1.9. The selected co-doped ceria samples were tested as solid electrolytes in solid oxide fuel cells operating in the intermediate temperature range 500-750°C.

Enhanced Ionic Conductivity in Nanostructured, Heavily Doped Ceria Ceramics

2006 ◽  
Vol 16 (1) ◽  
pp. 107-113 ◽  
Author(s):  
M. G. Bellino ◽  
D. G. Lamas ◽  
N. E. Walsöe de Reca
Keyword(s):  
Ionic Conductivity ◽  
Doped Ceria ◽  
Heavily Doped

Ionic conductivity of high-purity Gd-doped ceria solid solutions

2006 ◽  
Vol 41 (3) ◽  
pp. 563-568 ◽  
Author(s):  
T.S. Zhang ◽  
J. Ma ◽  
H. Cheng ◽  
S.H. Chan
Keyword(s):  
Ionic Conductivity ◽  
Solid Solutions ◽  
High Purity ◽  
Doped Ceria ◽  
Ceria Solid Solutions
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