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Title: Ionic and electronic transport in calcium-substituted LaAlO3 perovskites prepared via mechanochemical route
Author: Fabián, Martin
Arias-Serrano, Blanca I.
Yaremchenko, Aleksey
Kolev, Hristo
Kaňuchová, Mária
Briančin, Jaroslav
Keywords: Lanthanum aluminate
Solid electrolyte
Issue Date: 2019
Publisher: Elsevier
Abstract: The present work explores mechanosynthesis of lanthanum aluminate-based perovskite ceramics and corresponding effects on ionic-electronic transport properties. La1-xCaxAlO3-δ (x = 0.05-0.20) nanopowders were prepared via one-step high-energy mechanochemical processing. Sintering at 1450°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-δ increases with calcium content up to 10 at.% in the lanthanum sublattice and then levels off at ~6×10-3 S/cm at 900°C. La1-xCaxAlO3-δ 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°C in air and increases with Ca content, with temperature and with reducing p(O2). Impedance spectroscopy results showed however that electrical properties of mechanosynthesized La1-xCaxAlO3-δ ceramics below ~800°C are determined by prevailing grain boundary contribution to the total resistivity.
Peer review: yes
DOI: 10.1016/j.jeurceramsoc.2019.07.038
ISSN: 0955-2219
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