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authors |
Fabian, M; Arias-Serrano, BI; Yaremchenko, AA; Kolev, H; Kanuchova, M; Briancin, J |
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nationality |
International |
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journal |
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY |
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author keywords |
Lanthanum aluminate; Mechanosynthesis; Perovskite; Conductivity; Solid electrolyte |
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keywords |
ELECTRICAL-CONDUCTIVITY; COMBUSTION SYNTHESIS; LANTHANUM ALUMINATE; OXIDE; SR; BEHAVIOR; POWDER; LA0.95SR0.05ALO3-DELTA; LA0.95SR0.05GAO3-DELTA; LAGAO3 |
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abstract |
The present work explores mechanosynthesis of lanthanum aluminate-based perovskite ceramics and corresponding effects on ionic-electronic transport properties. La1-xCaxAlO3-delta (x = 0.05-0.20) nanopowders were prepared via one-step high-energy mechanochemical processing. Sintering at 1450 degrees C yielded dense ceramics with submicron grains. As-prepared powders and sintered ceramics were characterized by XRPD, XPS and SEM. Electrochemical studies showed that partial oxygen-ionic conductivity in prepared La1-xCaxAlO3-delta increases with calcium content up to 10 at.% in the lanthanum sublattice and then levels off at similar to 6 x 10(-3) S/cm at 900 degrees C. La1-xCaxAlO3-delta ceramics are mixed conductors under oxidizing conditions and ionic conductors with negligible contribution of electronic transport in reducing atmospheres. Oxygen-ionic contribution to the total conductivity is 20-68% at 900 degrees C in air and increases with Ca content, with temperature and with reducing p(O-2). Impedance spectroscopy results showed however that electrical properties of mechanosynthesized La1-xCaxAlO3-delta ceramics below similar to 800 degrees C are determined by prevailing grain boundary contribution to the total resistivity. |
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publisher |
ELSEVIER SCI LTD |
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issn |
0955-2219 |
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isbn |
1873-619X |
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year published |
2019 |
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volume |
39 |
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issue |
16 |
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beginning page |
5298 |
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ending page |
5308 |
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digital object identifier (doi) |
10.1016/j.jeurceramsoc.2019.07.038 |
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web of science category |
Materials Science, Ceramics |
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subject category |
Materials Science |
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unique article identifier |
WOS:000488140300023
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