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Title: Mixed conductivity and Mössbauer spectra of (La0.5Sr0.5)1 — xFe1 — yAlyO3 — d (x = 0 — 0.05, y = 0 — 0.30)
Other Titles: Смешанная проводимость и мёссбауэровские спектры (La0.5Sr0.5)1 — xFe1 — yAlyO3 — d (x = 0 — 0.05, y = 0 — 0.30)
Authors: Waerenborgh, Joao C.
Viskup, Alexander P.
Kharton, Vladislav V.
Yakovlev, Sergey O.
Patrakeev, Mikhail V.
Gaczynski, Piotr
Marozau, Ivan P.
Yaremchenko, Aleksey A.
Shaula, Aliaksandr L.
Samakhval, Victor V.
Keywords: ЭБ БГУ::ЕСТЕСТВЕННЫЕ И ТОЧНЫЕ НАУКИ::Химия
Issue Date: 2006
Publisher: Journal of Solid State Chemistry
Citation: Journal of Solid State Chemistry 179 (2006) 1273-1284
Abstract: Aluminum incorporation in the rhombohedrally distorted perovskite lattice of (Lao.sSro.sJi-.xFe^AlyCb^ (x = 0 -0 .0 5 , у = 0-0.30) decreases the unit cell volume and partial ionic and p-type electronic conductivities, while the oxygen nonstoichiometry and thermal expansion at 900-1200 К increase on doping. The creation o f А-site cation vacancies has an opposite effect on the transport properties of Al-substituted ceramics. The maximum А-site deficiency tolerated by the (La,Sr)(Fe,Al)03_£ structure is however limited, close to 3-4%. The Mossbauer spectroscopy revealed progressive localization o f electron holes and a mixed charge-compensation mechanism, which results in higher average oxidation state of iron when Al3+ concentration increases. The average thermal expansion coefficients of (La0.5Sr0.5) i - ,F e 1_>AlJ,O3 _a are (12.2-13.0) x lO ^K " 1 at 300-900K and (20.1-30.0) x 10"6K_I at 900-1200K in air. The steady-state oxygen permeability (OP) of dense Al-containing membranes is determined mainly by the bulk ionic conductivity. The ion transference numbers at 973-1223 К in air, calculated from the oxygen permeation and faradaic efficiency (FE) data, vary in the range 1 x 10_4-3 x 10-3, increasing with temperature. © 2006 Elsevier Inc. All rights reserved.
URI: http://elib.bsu.by/handle/123456789/7259
Appears in Collections:Публикации работников Центра проблем развития образования ГУУиНМР

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