Material properties of perovskites in the quasi-ternary system LaFeO3–LaCoO3–LaNiO3

Tietz, F.; Arul Raj, I.; Ma, Q.; Baumann, S.; Mahmoud, A.; Hermann, R. P.

doi:10.1016/j.jssc.2016.01.024

Title: Material properties of perovskites in the quasi-ternary system LaFeO₃–LaCoO₃–LaNiO₃

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Abstract

We present an overview on the variation of electrical conductivity, oxygen permeation, oxygen surface exchange 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(Ni_0.5Fe_0.5)_1-xCo_xO₃ and LaNi_{0.5- x}Fe_xCo_0.5O₃, 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 LaNi_0.5Fe_0.5O₃ for which 60% rhombohedral and 40% orthorhombic phase was found. Moreover, 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 LaCo_0.5Fe_0.5O₃. The oxygen permeation of samples with promising conductivities at 800 C was one order of magnitude lower than that of La_0.6Sr_0.4Co_0.8Fe_0.2O₃ (LSCF). The highest value of 0.017 ml cm^-2 min-1 at 950 C was obtained with LaNi_0.5Co_0.5O₃. The coefficients of thermal expansion varied in the range of 13.2 x 10^-6 K^-1 and 21.9 x 10^-6 K^-1 for LaNi_0.5Fe_0.5O₃ and LaCoO₃, respectively. ⁵⁷Fe M ssbauer spectroscopy was used as probe for themore »« less

Authors:

Tietz, F. ^[1]; Arul Raj, I. ^[2]; Ma, Q. ^[1]; Baumann, S. ^[1]; Mahmoud, A. ^[1]; Hermann, R. P. ^[3]

Julich Research Centre (Germany)
Central Electrochemical Research Inst., Tamil Nadu (India)
Julich Research Centre (Germany); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Publication Date:: Tue Feb 02 00:00:00 EST 2016

Research Org.:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Org.:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

OSTI Identifier:: 1261328

Alternate Identifier(s):: OSTI ID: 1359501

Grant/Contract Number:: AC05-00OR22725

Resource Type:: Accepted Manuscript

Journal Name:: Journal of Solid State Chemistry

Additional Journal Information:: Journal Volume: 237; Journal Issue: C; Journal ID: ISSN 0022-4596

Publisher:: Elsevier

Country of Publication:: United States

Language:: English

Subject:: 36 MATERIALS SCIENCE; Perovskites; Electrical conductivity; Thermal expansion; Oxygen permeation; Mossbauer spectroscopy

Citation Formats


                    Tietz, F., Arul Raj, I., Ma, Q., Baumann, S., Mahmoud, A., and Hermann, R. P. Material properties of perovskites in the quasi-ternary system LaFeO3–LaCoO3–LaNiO3.  United States: N. p., 2016. 
Web.  doi:10.1016/j.jssc.2016.01.024.

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                    Tietz, F., Arul Raj, I., Ma, Q., Baumann, S., Mahmoud, A., & Hermann, R. P. Material properties of perovskites in the quasi-ternary system LaFeO3–LaCoO3–LaNiO3.  United States.  https://doi.org/10.1016/j.jssc.2016.01.024

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                    Tietz, F., Arul Raj, I., Ma, Q., Baumann, S., Mahmoud, A., and Hermann, R. P. Tue .  
"Material properties of perovskites in the quasi-ternary system LaFeO3–LaCoO3–LaNiO3".  United States.  https://doi.org/10.1016/j.jssc.2016.01.024.  https://www.osti.gov/servlets/purl/1261328.

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@article{osti_1261328,

  title        = {Material properties of perovskites in the quasi-ternary system LaFeO3–LaCoO3–LaNiO3},

  author       = {Tietz, F. and Arul Raj, I. and Ma, Q. and Baumann, S. and Mahmoud, A. and Hermann, R. P.},

  abstractNote = {We present an overview on the variation of electrical conductivity, oxygen permeation, oxygen surface exchange 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. Moreover, 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 x 10-6 K-1 and 21.9 x 10-6 K-1 for LaNi0.5Fe0.5O3 and LaCoO3, respectively. 57Fe M ssbauer spectroscopy was used as probe for the oxidation states, local environment and magnetic properties of iron ions as a function of chemical composition. Ultimately, the substitution had a great influence on the chemical properties of the materials.},

  doi          = {10.1016/j.jssc.2016.01.024},

  journal      = {Journal of Solid State Chemistry},

  number       = C,

  volume       = 237,

  place        = {United States},

  year         = {Tue Feb 02 00:00:00 EST 2016},

  month        = {Tue Feb 02 00:00:00 EST 2016}

}

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Title: Material properties of perovskites in the quasi-ternary system LaFeO3–LaCoO3–LaNiO3

Abstract

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Title: Material properties of perovskites in the quasi-ternary system LaFeO₃–LaCoO₃–LaNiO₃