Crystal structure, oxygen nonstoichiometry, thermal expansion and conductivity of (Nd,Sr)(Fe,Co)O-3 (-) (delta) oxides / Elkalashy Sh. I.,Aksenova T. V.,Urusova A. S.,Cherepanov V. A. // SOLID STATE IONICS. - 2016. - V. 295, l. . - P. 96-103.

ISSN/EISSN:

0167-2738 / 1872-7689

Type:

Article

Abstract:

A series of samples with overall composition Nd-1 - xSrxFe1 - yCOyO3 (- delta) (x = 0.7, 0.0 <= y <= 1.0) and (y = 0.3, 0.0 <= x <= 1.0) were prepared by glycerol nitrate technique and characterized by X-ray diffraction, thermogravimetric analysis, iodometric titration and dilatometry. Nd-1 (-) xSrxFe0.7CO0.3O3 (-) (delta) with 0.0 <= x <= 0.5 possesses orthorhombic structure (sp. gr. Pbnm) and reveals O-type -> O'-type -> O-type structural transition around x = 0.3. The orthorhombic distortion decreases with the increasing strontium substitution and solid solutions Nd-1 - xSrxFe0.7Co0.3O3 (- delta) with 0.7 <= x <= 1.0 and Nd0.3Sr0.7Fe1 - yCoyO3 - (delta) with 0.0 <= y <= 1.0 exhibit the cubic structure (sp. gr. Pm3m). The structural parameters were refined using Rietveld full-profile analysis. The changes of oxygen content in Nd-1 - xSrxFe1 - yCoyO3 (-) (delta) versus temperature were determined by the thermogravimetric analysis. The gradual substitution of neodymium by strontium or of iron by cobalt leads to the decrease of oxygen content. The thermal expansion measurements of Nd1 - xSrxFe0.7Co0.3O3 - (delta) (x = 0.3; 0.4; 0.5 and 0.7) were performed and chemical expansion constituents have been separated. The electrical conductivity significantly increased with strontium content in low temperature range. The influence of Sr content diminished in high temperature range. (C) 2016 Elsevier B.V. All rights reserved.

Author keywords:

Solid solution; X-ray diffraction; Crystal-structure; Thermal expansion; Oxygen nonstoichiometry; Electrical conductivity ELECTRONIC BAND-STRUCTURE; FUEL-CELLS; PHASE-EQUILIBRIA; CATHODE MATERIALS; DEFECT STRUCTURE; COMPLEX OXIDES; LN; ND; SM; LA

DOI:

10.1016/j.ssi.2016.08.005

Web of Science ID:

ISI:000384386200013

Соавторы в МНС:

Другие поля

Поле	Значение
Month	NOV 1
Publisher	ELSEVIER SCIENCE BV
Address	PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
Language	English
EISSN	1872-7689
Keywords-Plus	ELECTRONIC BAND-STRUCTURE; FUEL-CELLS; PHASE-EQUILIBRIA; CATHODE MATERIALS; DEFECT STRUCTURE; COMPLEX OXIDES; LN; ND; SM; LA
Research-Areas	Chemistry; Physics
Web-of-Science-Categories	Chemistry, Physical; Physics, Condensed Matter
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 Russian Federation {[}1039]; Act 211 Government of the Russian Federation {[}02.A03.21.0006]
Funding-Text	This work has been made within the State Task from the Ministry of Education and Science of Russian Federation (project no. 1039) and by Act 211 Government of the Russian Federation, contract no. 02.A03.21.0006.
Number-of-Cited-References	35
Usage-Count-Last-180-days	6
Usage-Count-Since-2013	18
Journal-ISO	Solid State Ion.
Doc-Delivery-Number	DX4YE