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Title: Mixed conductivity and Mossbauer spectra of (La{sub 0.5}Sr{sub 0.5}){sub 1-x}Fe{sub 1-y}Al{sub y}O{sub 3-{delta}} (x=0-0.05, y=0-0.30)

Abstract

Aluminum incorporation in the rhombohedrally distorted perovskite lattice of (La{sub 0.5}Sr{sub 0.5}){sub 1-x}Fe{sub 1-y}Al{sub y}O{sub 3-{delta}} (x=0-0.05, y=0-0.30) decreases the unit cell volume and partial ionic and p-type electronic conductivities, while the oxygen nonstoichiometry and thermal expansion at 900-1200K increase on doping. The creation of A-site cation vacancies has an opposite effect on the transport properties of Al-substituted ceramics. The maximum A-site deficiency tolerated by the (La,Sr)(Fe,Al)O{sub 3-{delta}} structure is however limited, close to 3-4%. The Mossbauer spectroscopy revealed progressive localization of electron holes and a mixed charge-compensation mechanism, which results in higher average oxidation state of iron when Al{sup 3+} concentration increases. The average thermal expansion coefficients of (La{sub 0.5}Sr{sub 0.5}){sub 1-x}Fe{sub 1-y}Al{sub y}O{sub 3-{delta}} are (12.2-13.0)x10{sup -6}K{sup -1} at 300-900K and (20.1-30.0)x10{sup -6}K{sup -1} 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 973-1223K in air, calculated from the oxygen permeation and faradaic efficiency (FE) data, vary in the range 1x10{sup -4}-3x10{sup -3}, increasing with temperature.

Authors:
 [1];  [2];  [3];  [4];  [4];  [2];  [4];  [4];  [4];  [3]
  1. Department of Ceramics and Glass Engineering, CICECO, University of Aveiro, 3810-193 Aveiro (Portugal) and Institute of Physicochemical Problems, Belarus State University, 14 Leningradskaya Street, 220050 Minsk (Belarus)
  2. Chemistry Department, ITN/CFMC-UL, Estrada Nacional 10, P-2686-953 Sacavem (Portugal)
  3. Institute of Physicochemical Problems, Belarus State University, 14 Leningradskaya Street, 220050 Minsk (Belarus)
  4. Department of Ceramics and Glass Engineering, CICECO, University of Aveiro, 3810-193 Aveiro (Portugal)
Publication Date:
OSTI Identifier:
20784984
Resource Type:
Journal Article
Journal Name:
Journal of Solid State Chemistry
Additional Journal Information:
Journal Volume: 179; Journal Issue: 4; Other Information: DOI: 10.1016/j.jssc.2006.01.037; PII: S0022-4596(06)00046-6; Copyright (c) 2006 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0022-4596
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; ALUMINIUM COMPOUNDS; ALUMINIUM IONS; CERAMICS; FERRITES; HOLES; IONIC CONDUCTIVITY; LANTHANUM COMPOUNDS; MOESSBAUER EFFECT; OXYGEN; PERMEABILITY; PEROVSKITE; STEADY-STATE CONDITIONS; STRONTIUM COMPOUNDS; THERMAL EXPANSION; VACANCIES; VALENCE

Citation Formats

Kharton, Vladislav V, Waerenborgh, Joao C, Viskup, Alexander P, Yakovlev, Sergey O, Patrakeev, Mikhail V, Institute of Solid State Chemistry, Ural Division of RAS, 91 Pervomaiskaya Street, Ekaterinburg 620219, Gaczynski, Piotr, Marozau, Ivan P, Yaremchenko, Aleksey A, Shaula, Aliaksandr L, and Samakhval, Victor V. Mixed conductivity and Mossbauer spectra of (La{sub 0.5}Sr{sub 0.5}){sub 1-x}Fe{sub 1-y}Al{sub y}O{sub 3-{delta}} (x=0-0.05, y=0-0.30). United States: N. p., 2006. Web. doi:10.1016/j.jssc.2006.01.037.
Kharton, Vladislav V, Waerenborgh, Joao C, Viskup, Alexander P, Yakovlev, Sergey O, Patrakeev, Mikhail V, Institute of Solid State Chemistry, Ural Division of RAS, 91 Pervomaiskaya Street, Ekaterinburg 620219, Gaczynski, Piotr, Marozau, Ivan P, Yaremchenko, Aleksey A, Shaula, Aliaksandr L, & Samakhval, Victor V. Mixed conductivity and Mossbauer spectra of (La{sub 0.5}Sr{sub 0.5}){sub 1-x}Fe{sub 1-y}Al{sub y}O{sub 3-{delta}} (x=0-0.05, y=0-0.30). United States. https://doi.org/10.1016/j.jssc.2006.01.037
Kharton, Vladislav V, Waerenborgh, Joao C, Viskup, Alexander P, Yakovlev, Sergey O, Patrakeev, Mikhail V, Institute of Solid State Chemistry, Ural Division of RAS, 91 Pervomaiskaya Street, Ekaterinburg 620219, Gaczynski, Piotr, Marozau, Ivan P, Yaremchenko, Aleksey A, Shaula, Aliaksandr L, and Samakhval, Victor V. Sat . "Mixed conductivity and Mossbauer spectra of (La{sub 0.5}Sr{sub 0.5}){sub 1-x}Fe{sub 1-y}Al{sub y}O{sub 3-{delta}} (x=0-0.05, y=0-0.30)". United States. https://doi.org/10.1016/j.jssc.2006.01.037.
@article{osti_20784984,
title = {Mixed conductivity and Mossbauer spectra of (La{sub 0.5}Sr{sub 0.5}){sub 1-x}Fe{sub 1-y}Al{sub y}O{sub 3-{delta}} (x=0-0.05, y=0-0.30)},
author = {Kharton, Vladislav V and Waerenborgh, Joao C and Viskup, Alexander P and Yakovlev, Sergey O and Patrakeev, Mikhail V and Institute of Solid State Chemistry, Ural Division of RAS, 91 Pervomaiskaya Street, Ekaterinburg 620219 and Gaczynski, Piotr and Marozau, Ivan P and Yaremchenko, Aleksey A and Shaula, Aliaksandr L and Samakhval, Victor V},
abstractNote = {Aluminum incorporation in the rhombohedrally distorted perovskite lattice of (La{sub 0.5}Sr{sub 0.5}){sub 1-x}Fe{sub 1-y}Al{sub y}O{sub 3-{delta}} (x=0-0.05, y=0-0.30) decreases the unit cell volume and partial ionic and p-type electronic conductivities, while the oxygen nonstoichiometry and thermal expansion at 900-1200K increase on doping. The creation of A-site cation vacancies has an opposite effect on the transport properties of Al-substituted ceramics. The maximum A-site deficiency tolerated by the (La,Sr)(Fe,Al)O{sub 3-{delta}} structure is however limited, close to 3-4%. The Mossbauer spectroscopy revealed progressive localization of electron holes and a mixed charge-compensation mechanism, which results in higher average oxidation state of iron when Al{sup 3+} concentration increases. The average thermal expansion coefficients of (La{sub 0.5}Sr{sub 0.5}){sub 1-x}Fe{sub 1-y}Al{sub y}O{sub 3-{delta}} are (12.2-13.0)x10{sup -6}K{sup -1} at 300-900K and (20.1-30.0)x10{sup -6}K{sup -1} 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 973-1223K in air, calculated from the oxygen permeation and faradaic efficiency (FE) data, vary in the range 1x10{sup -4}-3x10{sup -3}, increasing with temperature.},
doi = {10.1016/j.jssc.2006.01.037},
url = {https://www.osti.gov/biblio/20784984}, journal = {Journal of Solid State Chemistry},
issn = {0022-4596},
number = 4,
volume = 179,
place = {United States},
year = {2006},
month = {4}
}