CRYSTAL-STRUCTURE, ELECTRICAL AND MAGNETIC-PROPERTIES OF LA1-XSRXCOO3-Y / PETROV AN,KONONCHUK OF,ANDREEV AV,CHEREPANOV VA,KOFSTAD P // SOLID STATE IONICS. - 1995. - V. 80, l. 3-4. - P. 189-199.

ISSN/EISSN:

0167-2738 / нет данных

Type:

Article

Abstract:

The crystal structure and properties of La1-xSrxCoO3-y with strontium contents ranging from x = 0.1 to x = 0.7 have been studied. The lattice parameters were measured as a function of temperature (4.2-400 K) and the crystal structure was found to change from rhombohedral (at low temperatures and values of x) to cubic. While LaCoO3 is paramagnetic the oxides in the composition range 0.2 < x < 0.6 are soft ferromagnets. The strontium additions are compensated by the formation of Co4+ (cobalt ions with one positive effective charge, Co-Co(.)) and oxygen vacancies (V-O(..)). From the results it is concluded that the relative importance of oxygen vacancies increases with increasing temperature and decreasing oxygen activity. As a result the concentration of electronic charge carriers - and the resultant electrical conductivity - decrease with increasing temperature. The defect structure is discussed and it is concluded that defect associations - probably between oxygen vacancies and strontium ions - and formation of microdomains of perovskite-related phases are important aspects of the overall structure of these perovskite phases.

Author keywords:

STRONTIUM-DOPED LANTHANUM COBALTITE; CRYSTAL STRUCTURE; MAGNETIC PROPERTIES; ELECTRICAL CONDUCTIVITY; DEFECT STRUCTURE RARE-EARTH; NONSTOICHIOMETRY; COEFFICIENT

DOI:

10.1016/0167-2738(95)00114-L

Web of Science ID:

ISI:A1995RW45100003

Соавторы в МНС:

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Другие поля

Поле	Значение
Month	SEP
Publisher	ELSEVIER SCIENCE BV
Address	PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
Language	English
Keywords-Plus	RARE-EARTH; NONSTOICHIOMETRY; COEFFICIENT
Research-Areas	Chemistry; Physics
Web-of-Science-Categories	Chemistry, Physical; Physics, Condensed Matter
ResearcherID-Numbers	Andreev, Alexander/B-6057-2011 Gentleman, Molly/A-7137-2010 Cherepanov, Vladimir/E-6451-2014
ORCID-Numbers	Cherepanov, Vladimir/0000-0003-3653-6459
Number-of-Cited-References	17
Usage-Count-Last-180-days	7
Usage-Count-Since-2013	80
Journal-ISO	Solid State Ion.
Doc-Delivery-Number	RW451