Phase equilibria, crystal structure, oxygen nonstoichiometry and thermal expansion of complex oxides in the Nd2O3 - SrO - Fe2O3 system / Aksenova T. V.,Vakhromeeva A. E.,Elkalashy Sh. I.,Urusova A. S.,Cherepanov V. A. // JOURNAL OF SOLID STATE CHEMISTRY. - 2017. - V. 251, l. . - P. 70-78.

ISSN/EISSN:

0022-4596 / 1095-726X

Type:

Article

Abstract:

The phase equilibria in the 1/2 Nd2O3 SrO 1/2 Fe2O3 system were systematically studied at 1373 K in air. The homogeneity ranges and crystal structure of the solid solutions Nd1-xSrxFeO3-delta with 0.0 <= x <= 0.6 (sp. gr. Pbnm) and with 0.7 <= x <= 0.9 (sp. gr. Pm3m), Sr2-yNdyFeO4-delta with 0.7 <= y <= 0.9 (sp. gr. I4/mmm), Sr(3-)zNd(z)Fe(2)O(7-delta) with 0.0 <= z <= 0.4 and 1.8 <= z <= 1.9 (sp. gr. I4/mmm) and Sr4-uNduFe3O10-delta with 0.7 <= u <= 0.9 (sp. gr. I4/mmm) were determined by X-ray diffraction analysis of quenched samples. The structural parameters of single-phase oxides were refined by the Rietveld profile method. The changes of oxygen content in the solid solutions Nd1-xSrxFeO3-delta (0.2 <= x <= 0.9), Sr3-zNdzFe2O7-delta (0.0 <= z <= 0.4 and z=1.9) and Sr4-uNduFe3O10-delta (0.7 <= u <= 0.9) versus temperature in air were determined by thermogravimetric analysis. Gradual substitution of neodymium by strontium leads to the decrease of the oxygen content. The average thermal expansion coefficients for the Nd1-xSrxFeO3-delta (0.6 <= x <= 0.8) samples were calculated within the temperature range 2981373 K in air. The project of isothermal-isobaric phase diagram for the Nd-Sr-Fe-O system to the compositional triangle of metallic components was presented.

Author keywords:

Phase diagram; Solid solution; X-ray diffraction; Crystal structure; Thermal expansion; Oxygen content RARE-EARTH ORTHOFERRITES; FUEL-CELLS; MOSSBAUER-SPECTROSCOPY; ELECTRICAL-PROPERTIES; DIELECTRIC-PROPERTIES; HIGH-TEMPERATURES; DEFECT STRUCTURE; PEROVSKITE; NDFEO3; LA

DOI:

10.1016/j.jssc.2017.04.015

Web of Science ID:

ISI:000402581200012

Соавторы в МНС:

Другие поля

Поле	Значение
Month	JUL
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	RARE-EARTH ORTHOFERRITES; FUEL-CELLS; MOSSBAUER-SPECTROSCOPY; ELECTRICAL-PROPERTIES; DIELECTRIC-PROPERTIES; HIGH-TEMPERATURES; DEFECT STRUCTURE; PEROVSKITE; NDFEO3; LA
Research-Areas	Chemistry
Web-of-Science-Categories	Chemistry, Inorganic \& Nuclear; Chemistry, Physical
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]; Act 211 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 16-53-45010) and by Act 211 Government of the Russian Federation, agreement 02.A03.21.0006.
Number-of-Cited-References	47
Usage-Count-Last-180-days	10
Usage-Count-Since-2013	10
Journal-ISO	J. Solid State Chem.
Doc-Delivery-Number	EW5YA