Oxygen nonstoichiometry, thermal expansion and high-temperature electrical properties of layered NdBaCo2O5+delta and SmBaCo2O5+delta / Aksenova T. V.,Gavrilova L. Yu.,Yaremchenko A. A.,Cherepanov V. A.,Kharton V. V. // MATERIALS RESEARCH BULLETIN. - 2010. - V. 45, l. 9. - P. 1288-1292.

ISSN/EISSN:

0025-5408 / нет данных

Type:

Article

Abstract:

Layered LnBaCo(2)O(5+delta) (La = 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 NdBaCo2O5.73 and SmBaCo2O5.61 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 8 variations and chemical contribution to the apparent thermal expansion in air are substantially lower compared to the disordered (Ln, A)CoO3-delta (A = Ca, Sr) analogues. The average thermal expansion coefficients are 23.1 x 10(-6) K-1 for NdBaCo2O5+delta and 20.8 x 10(-6) K-1 for SmBaCo2O5+delta at 300-1370 K and atmospheric oxygen pressure. These values are comparable to those of Bi2O3-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-2) range from 10(-10) to 1 atm, confirm predominant p-type electronic conductivity. (C) 2010 Elsevier Ltd. All rights reserved.

Author keywords:

X-ray diffraction; Thermogravimetric analysis; Thermal expansion OXIDE FUEL-CELLS; CHEMISTRY; LN; CONDUCTIVITY; PEROVSKITES; CATHODES; CRYSTAL; PR; LA; SM

DOI:

10.1016/j.materresbull.2010.05

Web of Science ID:

ISI:000281104900045

Соавторы в МНС:

Другие поля

Поле	Значение
Month	SEP
Publisher	PERGAMON-ELSEVIER SCIENCE LTD
Address	THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND
Language	English
Keywords-Plus	OXIDE FUEL-CELLS; CHEMISTRY; LN; CONDUCTIVITY; PEROVSKITES; CATHODES; CRYSTAL; PR; LA; SM
Research-Areas	Materials Science
Web-of-Science-Categories	Materials Science, Multidisciplinary
Author-Email	Vladimir.cherepanov@usu.ru
ResearcherID-Numbers	Albe, Karsten/F-1139-2011 Kharton, Vladislav /P-6306-2014 Yaremchenko, Aleksey/H-2977-2013 Cherepanov, Vladimir/E-6451-2014
ORCID-Numbers	Yaremchenko, Aleksey/0000-0002-3837-5946 Cherepanov, Vladimir/0000-0003-3653-6459
Funding-Acknowledgement	RFBR {[}09-03-00620]; Federal Agency for Science and Innovations of Russian Federation; Federal Agency for Education of Russian Federation; FCT, Portugal {[}PTDC/CTM/64357/2006]
Funding-Text	This work was financially supported in parts by RFBR grant no. 09-03-00620, Federal Agency for Science and Innovations of Russian Federation, Federal Agency for Education of Russian Federation, and the FCT, Portugal (project PTDC/CTM/64357/2006).
Number-of-Cited-References	19
Usage-Count-Since-2013	29
Journal-ISO	Mater. Res. Bull.
Doc-Delivery-Number	641DM