Phase equilibria in the Y-Ba-Fe-O system / Urusova A. S.,Bryuzgina A. V.,Mychinko M. Yu,Mordvinova N. E.,Lebedev O. I.,Caignaert V.,Kiselev E. A.,Aksenova T. V.,Cherepanov V. A. // JOURNAL OF ALLOYS AND COMPOUNDS. - 2017. - V. 694, l. . - P. 375-382.

ISSN/EISSN:

0925-8388 / 1873-4669

Type:

Article

Abstract:

The phase equilibria in the Y - Ba - Fe - O system were systematically studied at 1373 K in air. The intermediate phases formed in the Y - Ba - Fe - O system at 1373 K in air were: Ba3YFe2O7.5+delta and BaFe1-xYxO3-delta. The combined X-ray diffraction and electron microscopy show that Ba3YFe2O7.5+delta exhibits the monoclinic structure a = 7.976(1) angstrom, b = 5.988(1) angstrom, c = 18.408(1) angstrom, beta = 90.028 (sp. gr. P2/c), which in the first approximation can be described as the orthorhombic structure with a tiny monoclinic distortion. High-temperature XRD of BaFeO3-delta within the temperature range 298-1273 K in air demonstrates a single phase with the orthorhombic structure (sp. gr. P2(1)2(1)2) that appears below 673 K, a single phase cubic BaFeO3-delta (sp. gr. Pm3m) that forms at temperature above 1273 K, and a mixture of two phases mentioned above that coexisted within 673-1273 K. These correlate with the results obtained by TGA and dilatometry methods. The substitution of yttrium for iron in BaFe1-xYxO3-delta leads to the formation of solid solutions with the cubic structure in air within (0.075 < x < 0.125) for slowly cooled samples. The homogeneity range has extended at 1373 K towards undoped BaFeO3-delta. The projection of isothermal isobaric phase diagram for the Y - Ba - Fe - O system at 1373 K in air to the compositional triangle of metallic components has been constructed. (C) 2016 Elsevier B.V. All rights reserved.

Author keywords:

Oxide materials; Oxygen nonstoichiometry; Phase diagram; X-ray diffraction; TEM OXIDE FUEL-CELLS; THERMODYNAMIC PROPERTIES; POWDER DIFFRACTION; CRYSTAL-STRUCTURE; BAFEO3-DELTA; PEROVSKITE; Y3FE5O12; YFEO3; BAO-Y2O3; NEUTRON

DOI:

10.1016/j.jallcom.2016.10.023

Web of Science ID:

ISI:000390622900051

Соавторы в МНС:

Другие поля

Поле	Значение
Month	FEB 15
Publisher	ELSEVIER SCIENCE SA
Address	PO BOX 564, 1001 LAUSANNE, SWITZERLAND
Language	English
EISSN	1873-4669
Keywords-Plus	OXIDE FUEL-CELLS; THERMODYNAMIC PROPERTIES; POWDER DIFFRACTION; CRYSTAL-STRUCTURE; BAFEO3-DELTA; PEROVSKITE; Y3FE5O12; YFEO3; BAO-Y2O3; NEUTRON
Research-Areas	Chemistry; Materials Science; Metallurgy \& Metallurgical Engineering
Web-of-Science-Categories	Chemistry, Physical; Materials Science, Multidisciplinary; Metallurgy \& Metallurgical Engineering
Author-Email	v.a.cherepanov@urfu.ru
ResearcherID-Numbers	Cherepanov, Vladimir/E-6451-2014
ORCID-Numbers	Cherepanov, Vladimir/0000-0003-3653-6459
Funding-Acknowledgement	Ministry of Education and Science of RF {[}1039]; Act 211 Government of the Russian Federation {[}02.A03.21.0006]
Funding-Text	This work was supported in parts by the Ministry of Education and Science of RF (State Task project 1039) and by Act 211 Government of the Russian Federation, agreement No 02.A03.21.0006.
Number-of-Cited-References	45
Usage-Count-Last-180-days	10
Usage-Count-Since-2013	22
Journal-ISO	J. Alloy. Compd.
Doc-Delivery-Number	EF9AK