Article (Scientific journals)
Material properties of perovskites in the quasi-ternary system LaFeO3-LaCoO3-LaNiO3
Tietz, F.; Arul Raj, I.; Ma, Q. et al.
2016In Journal of Solid State Chemistry, 237, p. 183-191
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Keywords :
Electrical conductivity; Mössbauer spectroscopy; Oxygen permeation; Perovskites; Thermal expansion; Electric conductivity; Lanthanum alloys; Metal ions; Oxygen; Oxygen permeable membranes; Perovskite; Powders; Sintering; Ternary systems; X ray diffraction; X ray powder diffraction; Coefficients of thermal expansions; DC electrical conductivity; Powder X ray diffraction; Rhombohedral structures; Ssbauer spectroscopies; Thermal expansion coefficients
Abstract :
[en] An overview is presented on the variation of electrical conductivity, oxygen permeation, and thermal expansion coefficient as a function of the composition of perovskites in the quasi-ternary system LaFeO3-LaCoO3-LaNiO3. Powders of thirteen nominal perovskite compositions were synthesized under identical conditions by the Pechini method. The powder X-ray diffraction data of two series, namely La(Ni0.5Fe0.5)1-xCoxO3 and LaNi0.5-xFexCo0.5O3, are presented after the powders had been sintered at 1100 °C for 6 h in air. The measurements revealed a rhombohedral structure for all compositions except LaNi0.5Fe0.5O3 for which 60% rhombohedral and 40% orthorhombic phase was found. The maximum DC electrical conductivity value of the perovskites at 800 °C was 1229 S cm-1 for the composition LaCoO3 and the minimum was 91 S cm-1 for the composition LaCo0.5Fe0.5O3. The oxygen permeation of samples with promising conductivities at 800 °C was one order of magnitude lower than that of La0.6Sr0.4Co0.8Fe0.2O3 (LSCF). The highest value of 0.017 ml cm-2 min-1 at 950 °C was obtained with LaNi0.5Co0.5O3. The coefficients of thermal expansion varied in the range of 13.2×10-6 K-1 and 21.9×10-6 K-1 for LaNi0.5Fe0.5O3 and LaCoO3, respectively. 57Fe Mössbauer spectroscopy was used as probe for the oxidation states, local environment and magnetic properties of iron ions as a function of chemical composition. The substitution had a great influence on the chemical properties of the materials. © 2016 Elsevier Inc. All rights reserved.
Disciplines :
Chemistry
Author, co-author :
Tietz, F.;  Forschungszentrum Jülich GmbH, Institute of Energy and Climate Research, Materials Synthesis and Processing (IEK-1), Jülich, Germany
Arul Raj, I.;  Central Electrochemical Research Institute, Karaikudi, Tamil Nadu, India
Ma, Q.;  Forschungszentrum Jülich GmbH, Institute of Energy and Climate Research, Materials Synthesis and Processing (IEK-1), Jülich, Germany
Baumann, S.;  Forschungszentrum Jülich GmbH, Institute of Energy and Climate Research, Materials Synthesis and Processing (IEK-1), Jülich, Germany
Mahmoud, Abdelfattah  ;  Université de Liège - ULiège > Département de chimie (sciences) > LCIS - GreenMAT
Hermann, Raphaël ;  Université de Liège - ULiège > Département de chimie (sciences) > Département de chimie (sciences)
Title :
Material properties of perovskites in the quasi-ternary system LaFeO3-LaCoO3-LaNiO3
Publication date :
2016
Journal title :
Journal of Solid State Chemistry
ISSN :
0022-4596
eISSN :
1095-726X
Publisher :
Academic Press Inc.
Volume :
237
Pages :
183-191
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
ORNL, Oak Ridge National Laboratory
Available on ORBi :
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