Oxygen nonstoichiometry, defect structure and oxygen diffusion in the double perovskite GdBaCo2O6-delta / Tsvetkov D. S.,Ananjev M. V.,Eremin V. A.,Zuev A. Yu.,Kurumchin E. Kh. // DALTON TRANSACTIONS. - 2014. - V. 43, l. 42. - P. 15937-15943.

ISSN/EISSN:

1477-9226 / 1477-9234

Type:

Article

Abstract:

Oxygen nonstoichiometry of GdBaCo2O6-delta was studied by means of the thermogravimetric technique in the temperature range 600-1000 degrees C. The defect structure model based on the simple cubic perovskite GdCo03\_5 was shown to be valid for GdBaCo2O6-delta up to temperatures as low as 600 degrees C. Two independent methods, namely dc-polarization with the YSZ microelectrode and O-18-isotope exchange with gas phase analysis, were used to determine the oxygen self-diffusion coefficient in the double perovskite GdBaCo2O6-delta. All measurements were carried out using ceramic samples identically prepared from the same single phase powder of GdBaCo2O6-delta. The experimental data on oxygen nonstoichiometry of GdBaCo2O6-delta allowed a precise calculation of the oxygen interphase exchange rate and the oxygen tracer diffusion coefficient on the basis of the isotope exchange measurements. The values of the oxygen self-diffusion coefficient measured by the dc-polarization technique were found to be in very good agreement with the ones of the oxygen tracer diffusion coefficient.

Author keywords:

TRACER DIFFUSION; EXCHANGE; GDBACO2O5+DELTA; CATHODES; SOFCS

DOI:

10.1039/c4dt01486c

Web of Science ID:

ISI:000343958900032

Соавторы в МНС:

Другие поля

Поле	Значение
Month	NOV 14
Publisher	ROYAL SOC CHEMISTRY
Address	THOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLAND
Language	English
EISSN	1477-9234
Keywords-Plus	TRACER DIFFUSION; EXCHANGE; GDBACO2O5+DELTA; CATHODES; SOFCS
Research-Areas	Chemistry
Web-of-Science-Categories	Chemistry, Inorganic \& Nuclear
Author-Email	dmitry.tsvetkov@wfu.ru
ResearcherID-Numbers	Kurumchin, Edhem/I-4214-2016 Zuev, Andrey/E-6220-2014 Ananyev, Maxim/F-5104-2014 Tsvetkov, Dmitry/N-2491-2016 Albe, Karsten/F-1139-2011
ORCID-Numbers	Kurumchin, Edhem/0000-0003-3701-9234 Ananyev, Maxim/0000-0002-2254-0193
Funding-Acknowledgement	RFBR {[}13-03-00519]; Federal Target Program {[}2012-1.5-14-000-2019-002-8888]
Funding-Text	This work was partly financially supported by RFBR grant no. 13-03-00519 and by the Federal Target Program no. 2012-1.5-14-000-2019-002-8888.
Number-of-Cited-References	16
Usage-Count-Since-2013	27
Journal-ISO	Dalton Trans.
Doc-Delivery-Number	AS0HP