authors |
Belov, DA; Shlyakhtina, AV; Abrantes, JCC; Chernyak, SA; Gasymova, GA; Karyagina, OK; Shcherbakova, LG |
nationality |
International |
journal |
SOLID STATE IONICS |
author keywords |
Fuel cell; Oxide ion conductivity; Mixed conductivity; Oxygen vacancy; Oxygen interstitials |
keywords |
OXYGEN STORAGE CAPACITY; ELECTRICAL-PROPERTIES; STABILIZED ZIRCONIA; DEFECT CHEMISTRY; PRASEODYMIUM; OXIDES; CONDUCTIVITY; GENERATION; METHANE; O-2 |
abstract |
We have studied the structure, microstructure, and electrochemical properties in air of (Pr-2 - Zr-x(x))Zr2O7 + (x/2) (X = 0.15, 0.32, 0.78), Pr2Zr2O7, and Pr-2(Zr-2 - Pr-x(x))O-7 - (x/2) (x = 0.1, 0.4, 1) materials. The solid solutions were prepared through coprecipitation followed by heat treatment of the precursors at 1550 degrees C for 4 h. According to XRD data, the extent of the pyrochlore-like Pr-2 xZr(2) th xO(7) th (x/2) solid solutions at 1550 degrees C is -6 mol.%, which is considerably smaller than that in the NdZrO and SmZrO systems at this temperature. Among the pyrochlores, the highest bulk conductivity was offered by the (Pr2-xZrx)Zr2O7 + x/2 (X = 0.15): 7.15 x 10-3 S/cm at 800 C (Ea= 0.66 eV).The pyrochlore-like Pr-2(Zr-2,Pr-x)O-7 x/2 (X = 0.1) had lower conductivity (3.97 x 10-3S/cm at 800 C). The highest bulk conductivity among the materials studied was found in the Pr(2)03-rich fluorite-like Pr-2(Zr-2 - Pr-x(x))O-7 - (x/2) with x = 1: similar to 0.217 S/cm at 800 degrees C (E-a = 0.0.31 eV). The temperature-dependent conductivity of the Pr2O3-rich fluorite-like solid solutions Pr-2(Zr-2 - Pr-x(x))O-7 (x/2) with x = 0.4 and 1 had a break at 560 C, suggesting a change in the mechanism of ion transport at this temperature. 2014 Elsevier B.V. All rights reserved. |
publisher |
ELSEVIER SCIENCE BV |
issn |
0167-2738 |
year published |
2015 |
volume |
271 |
beginning page |
79 |
ending page |
85 |
digital object identifier (doi) |
10.1016/j.ssi.2014.09.035 |
web of science category |
Chemistry, Physical; Physics, Condensed Matter |
subject category |
Chemistry; Physics |
unique article identifier |
WOS:000351961400013
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ciceco authors
impact metrics
journal analysis (jcr 2019):
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journal impact factor |
3.107 |
5 year journal impact factor |
2.904 |
category normalized journal impact factor percentile |
58.409 |
dimensions (citation analysis):
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altmetrics (social interaction):
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