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Title: Oxygen nonstoichiometry, thermal expansion and high-temperature electrical properties of layered NdBaCo{sub 2}O{sub 5+{delta}} and SmBaCo{sub 2}O{sub 5+{delta}}

Abstract

Layered LnBaCo{sub 2}O{sub 5+{delta}} (Ln = Nd, Sm) with the cation-ordered double perovskite structure were synthesized by the solid-state reaction route and characterized by X-ray diffraction, thermogravimetric analysis and dilatometry. For NdBaCo{sub 2}O{sub 5.73} and SmBaCo{sub 2}O{sub 5.61} equilibrated with atmospheric oxygen at low temperatures, tetragonal and orthorhombic polymorphs were found to form, respectively. The oxygen content at 300-1300 K decreases with decreasing rare-earth cation size, whilst {delta} variations and chemical contribution to the apparent thermal expansion in air are substantially lower compared to the disordered (Ln, A)CoO{sub 3-{delta}} (A = Ca, Sr) analogues. The average thermal expansion coefficients are 23.1 x 10{sup -6} K{sup -1} for NdBaCo{sub 2}O{sub 5+{delta}} and 20.8 x 10{sup -6} K{sup -1} for SmBaCo{sub 2}O{sub 5+{delta}} at 300-1370 K and atmospheric oxygen pressure. These values are comparable to those of Bi{sub 2}O{sub 3}-based ionic conductors, but are incompatible with common electrolytes such as stabilized zirconia or doped ceria. The oxygen partial pressure dependencies of the total conductivity and Seebeck coefficient, studied in the P(O{sub 2}) range from 10{sup -10} to 1 atm, confirm predominant p-type electronic conductivity.

Authors:
;  [1];  [2];  [2]
  1. Department of Chemistry, Ural State University, Lenin av. 51, Ekaterinburg (Russian Federation)
  2. Department of Ceramics and Glass Engineering, CICECO, University of Aveiro, 3810-193 Aveiro (Portugal)
Publication Date:
OSTI Identifier:
22207388
Resource Type:
Journal Article
Journal Name:
Materials Research Bulletin
Additional Journal Information:
Journal Volume: 45; Journal Issue: 9; Other Information: Copyright (c) 2010 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0025-5408
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; BISMUTH OXIDES; DILATOMETRY; DOPED MATERIALS; ELECTRICAL PROPERTIES; ORTHORHOMBIC LATTICES; OXYGEN; PEROVSKITE; THERMAL EXPANSION; THERMAL GRAVIMETRIC ANALYSIS; X-RAY DIFFRACTION

Citation Formats

Aksenova, T. V., Gavrilova, L. Yu., Yaremchenko, A. A., Cherepanov, V.A., E-mail: Vladimir.cherepanov@usu.ru, and Kharton, V. V. Oxygen nonstoichiometry, thermal expansion and high-temperature electrical properties of layered NdBaCo{sub 2}O{sub 5+{delta}} and SmBaCo{sub 2}O{sub 5+{delta}}. United States: N. p., 2010. Web. doi:10.1016/J.MATERRESBULL.2010.05.004.
Aksenova, T. V., Gavrilova, L. Yu., Yaremchenko, A. A., Cherepanov, V.A., E-mail: Vladimir.cherepanov@usu.ru, & Kharton, V. V. Oxygen nonstoichiometry, thermal expansion and high-temperature electrical properties of layered NdBaCo{sub 2}O{sub 5+{delta}} and SmBaCo{sub 2}O{sub 5+{delta}}. United States. https://doi.org/10.1016/J.MATERRESBULL.2010.05.004
Aksenova, T. V., Gavrilova, L. Yu., Yaremchenko, A. A., Cherepanov, V.A., E-mail: Vladimir.cherepanov@usu.ru, and Kharton, V. V. 2010. "Oxygen nonstoichiometry, thermal expansion and high-temperature electrical properties of layered NdBaCo{sub 2}O{sub 5+{delta}} and SmBaCo{sub 2}O{sub 5+{delta}}". United States. https://doi.org/10.1016/J.MATERRESBULL.2010.05.004.
@article{osti_22207388,
title = {Oxygen nonstoichiometry, thermal expansion and high-temperature electrical properties of layered NdBaCo{sub 2}O{sub 5+{delta}} and SmBaCo{sub 2}O{sub 5+{delta}}},
author = {Aksenova, T. V. and Gavrilova, L. Yu. and Yaremchenko, A. A. and Cherepanov, V.A., E-mail: Vladimir.cherepanov@usu.ru and Kharton, V. V.},
abstractNote = {Layered LnBaCo{sub 2}O{sub 5+{delta}} (Ln = Nd, Sm) with the cation-ordered double perovskite structure were synthesized by the solid-state reaction route and characterized by X-ray diffraction, thermogravimetric analysis and dilatometry. For NdBaCo{sub 2}O{sub 5.73} and SmBaCo{sub 2}O{sub 5.61} equilibrated with atmospheric oxygen at low temperatures, tetragonal and orthorhombic polymorphs were found to form, respectively. The oxygen content at 300-1300 K decreases with decreasing rare-earth cation size, whilst {delta} variations and chemical contribution to the apparent thermal expansion in air are substantially lower compared to the disordered (Ln, A)CoO{sub 3-{delta}} (A = Ca, Sr) analogues. The average thermal expansion coefficients are 23.1 x 10{sup -6} K{sup -1} for NdBaCo{sub 2}O{sub 5+{delta}} and 20.8 x 10{sup -6} K{sup -1} for SmBaCo{sub 2}O{sub 5+{delta}} at 300-1370 K and atmospheric oxygen pressure. These values are comparable to those of Bi{sub 2}O{sub 3}-based ionic conductors, but are incompatible with common electrolytes such as stabilized zirconia or doped ceria. The oxygen partial pressure dependencies of the total conductivity and Seebeck coefficient, studied in the P(O{sub 2}) range from 10{sup -10} to 1 atm, confirm predominant p-type electronic conductivity.},
doi = {10.1016/J.MATERRESBULL.2010.05.004},
url = {https://www.osti.gov/biblio/22207388}, journal = {Materials Research Bulletin},
issn = {0025-5408},
number = 9,
volume = 45,
place = {United States},
year = {2010},
month = {9}
}