Phase equilibria, crystal structure and properties of complex oxides in the Nd2O3-SrO-CoO system / Aksenova T. V.,Efimova T. G.,Lebedev O. I.,Elkalashy Sh. I.,Urusova A. S.,Cherepanov V. A. // JOURNAL OF SOLID STATE CHEMISTRY. - 2017. - V. 248, l. . - P. 183-191.

ISSN/EISSN:

0022-4596 / 1095-726X

Type:

Article

Abstract:

The phase equilibria in the 1/2Nd(2)O(3)-SrO-CoO system were systematically studied at 1373 K in air. The intermediate phases formed in the 1/2Nd(2)O(3)-SrO-CoO system at 1373 K in air are: Nd1-xSrxCoO3-delta (0.0 <= x <= 0.5 with orthorhombic structure, sp. gr. Pbnm and 0.6 <= x <= 0.95 whose structure was detected as cubic according to XRD sp. gr. Pm3m, but shown to be tetragonal by TEM due to the oxygen vacancy ordering), Nd2-ySryCoO4-delta (0.6 <= y <= 1.1 with tetragonal K2NiF4-type structure, sp. gr. I4/mmm) and Nd2-zSrzO3 (0.0 <= z <= 0.15 with hexagonal structure, sp. gr. P-3m1). The unit cell parameters for the single phase samples were refined by the Rietveld analysis. The changes of oxygen content in Nd1-xSrxCoO3-delta (0.6 <= x <= 0.95) and Ruddlesden-Popper oxide Nd2-ySryCoO4-delta were examined by TGA. All were found to be oxygen deficient phases. High-temperature dilatometry allows calculating the thermal expansion coefficient and evaluating the chemical expansion coefficient at high temperature. The projection of isothermal-isobaric phase diagram for the Nd-Sr-Co-O system at 1373 K in air to the compositional triangle of metallic components has been constructed. The phase equilibria in the studied Nd-Sr-Co-O system were compared to La-Sr-Co-O and Nd-M-Co-O (M=Ca and Ba).

Author keywords:

Phase equilibria; Solid solutions; Crystal structure; Oxygen nonstoichiometry; Oxygen vacancy ordering; Thermal expansion CO-O SYSTEM; RARE-EARTH; LN(1-X)SR(X)COO(3-DELTA) LN; TRANSPORT-PROPERTIES; CATHODE MATERIALS; FUEL-CELLS; NI-O; ND; LA; PEROVSKITES

DOI:

10.1016/j.jssc.2017.02.002

Web of Science ID:

ISI:000396386300024

Соавторы в МНС:

Другие поля

Поле	Значение
Month	APR
Publisher	ACADEMIC PRESS INC ELSEVIER SCIENCE
Address	525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 USA
Language	English
EISSN	1095-726X
Keywords-Plus	CO-O SYSTEM; RARE-EARTH; LN(1-X)SR(X)COO(3-DELTA) LN; TRANSPORT-PROPERTIES; CATHODE MATERIALS; FUEL-CELLS; NI-O; ND; LA; PEROVSKITES
Research-Areas	Chemistry
Web-of-Science-Categories	Chemistry, Inorganic \& Nuclear; Chemistry, Physical
Author-Email	v.a.cherepanov@urfu.ru
ResearcherID-Numbers	Cherepanov, Vladimir/E-6451-2014
ORCID-Numbers	Cherepanov, Vladimir/0000-0003-3653-6459
Funding-Acknowledgement	Russian Federation of Basic Research {[}16-53-45010]; Government of the Russian Federation {[}02.A03.21.0006]
Funding-Text	This work was supported in parts by the Russian Federation of Basic Research (Project no. 16-53-45010) and by Act 211 Government of the Russian Federation, Agreement no. 02.A03.21.0006.
Number-of-Cited-References	39
Usage-Count-Last-180-days	11
Usage-Count-Since-2013	11
Journal-ISO	J. Solid State Chem.
Doc-Delivery-Number	EO0KI