Defect formation and mechanical stability of perovskites based on LaCrO3 for solid oxide fuel cells (SOFC) / Hilpert K,Steinbrech RW,Boroomand F,Wessel E,Meschke F,Zuev A,Teller O,Nickel H,Singheiser L // JOURNAL OF THE EUROPEAN CERAMIC SOCIETY. - 2003. - V. 23, l. 16. - P. 3009-3020.

ISSN/EISSN:

0955-2219 / нет данных

Type:

Article

Abstract:

Perovskites on the basis of LaCrO3 are of interest as ceramic interconnect materials for the development of solid oxide fuel cells (SOFCs). The interconnects are exposed to oxidising and reducing atmospheres under operating conditions. Oxygen vacancy formation was determined as a function of oxygen partial pressure between I and 10(-22) bar at temperatures between 900 and 1100 degreesC. Different perovskite compositions made of (La,Ca/Sr)CrO3-delta, La(Cr,Mg)O3-delta, La(Cr,Mg/Cu/Co,Al)O3-delta, and (La,Ca)(Cr,Al)O3- were investigated. Defect models were evaluated to describe the oxygen vacancy formation and the respective thermodynamic data were determined. The results are used to explain existing literature data on the isothermal expansion of LaCrO3 based perovskites under reducing conditions. Complementary mechanical measurements with selected perovskite compositions revealed that lower oxygen partial pressure causes higher stiffness, strength and fracture toughness. The change in properties is discussed in terms of the observed ferroelastic domains and the interaction of the domain wall motion with the oxygen vacancies. (C) 2003 Elsevier Ltd. All rights reserved.

Author keywords:

defects; fuel cells; isothermal expansion; LaCrO3; mechanical properties; perovskites R-CURVE BEHAVIOR; LANTHANUM CHROMITE; EXPANSION; CERAMICS; TITANATE; SYSTEM

DOI:

10.1016/S0955-2219(03)00097-9

Web of Science ID:

ISI:000185685900003

Соавторы в МНС:

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Другие поля

Поле	Значение
Publisher	ELSEVIER SCI LTD
Address	THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLAND
Language	English
Keywords-Plus	R-CURVE BEHAVIOR; LANTHANUM CHROMITE; EXPANSION; CERAMICS; TITANATE; SYSTEM
Research-Areas	Materials Science
Web-of-Science-Categories	Materials Science, Ceramics
Author-Email	k.hilpert@fz-juelich.de
ResearcherID-Numbers	Zuev, Andrey/E-6220-2014 pelosato, renato/E-9950-2010
Number-of-Cited-References	30
Usage-Count-Last-180-days	3
Usage-Count-Since-2013	29
Journal-ISO	J. Eur. Ceram. Soc.
Doc-Delivery-Number	727XJ