Ionic and electronic transport in calcium-substituted LaAlO3 perovskites prepared via mechanochemical route
authors Fabian, M; Arias-Serrano, BI; Yaremchenko, AA; Kolev, H; Kanuchova, M; Briancin, J
nationality International
journal JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
author keywords Lanthanum aluminate; Mechanosynthesis; Perovskite; Conductivity; Solid electrolyte
keywords ELECTRICAL-CONDUCTIVITY; COMBUSTION SYNTHESIS; LANTHANUM ALUMINATE; OXIDE; SR; BEHAVIOR; POWDER; LA0.95SR0.05ALO3-DELTA; LA0.95SR0.05GAO3-DELTA; LAGAO3
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.
publisher ELSEVIER SCI LTD
issn 0955-2219
isbn 1873-619X
year published 2019
volume 39
issue 16
beginning page 5298
ending page 5308
digital object identifier (doi) 10.1016/j.jeurceramsoc.2019.07.038
web of science category Materials Science, Ceramics
subject category Materials Science
unique article identifier WOS:000488140300023
  ciceco authors
  impact metrics
journal analysis (jcr 2019):
journal impact factor 4.495
5 year journal impact factor 4.283
category normalized journal impact factor percentile 98.214
dimensions (citation analysis):
altmetrics (social interaction):



 


Apoio

1suponsers_list_ciceco.jpg