Homogeneity range, oxygen nonstoichiometry, thermal expansion and transport properties of La2-: XSrxNi1- yFeyO4+ δ / Gilev A.R., Kiselev E.A., Cherepanov V.A. // RSC Advances. - 2016. - V. 6, l. 77. - P. 72905-72917.

ISSN:

20462069

Type:

Article

Abstract:

A series of La2-xSrxNi1-yFeyO4+δ complex oxides adopting the K2NiF4-type structure (sp.gr. I4/mmm) was prepared via the decomposition of citrate-nitrate precursors, followed by multiple annealing treatments at 1100 °C in air. Strontium for lanthanum substitution in La2-xSrxNi1-yFeyO4+δ leads to a progressive increase of iron solubility (y) which reaches maximum values at x = 1.0-1.2. The crystal structure of single-phase samples was refined by the Reitveld method. The unit cell volume increases with y and decreases with x in La2-xSrxNi1-yFeyO4+δ. The solid solutions of La2-xSrxNi1-yFeyO4+δ were shown by TGA to be over-stoichiometric (δ > 0) at x = 0.5 and 0.6 and oxygen deficient (δ < 0) at x = 0.8 within the temperature range of 25-1050 °C in air. The thermal expansion coefficient of La2-xSrxNi1-yFeyO4+δ increases with x and y, varying within the range of (12-16) × 10-6 K-1 up to 700 °C in air. In the higher temperature range, the value of the TEC increases up to 20 × 10-6 K-1 due to a chemical expansion contribution. The total conductivity and Seebeck coefficient were measured in air from RT to 1100 °C. The maximum conductivity value equal to 289 S cm-1 was obtained for La1.2Sr0.8Ni0.9Fe0.1O4+δ at 460 °C in air. The conduction is temperature activated for all samples within the composition range under study. The temperature dependencies of the Seebeck coefficient were explained in the approximation of the small-polaron hopping mechanism. The charge carriers were electron holes localized on nickel forming Ni3+ cations in low- and high-spin states. © 2016 The Royal Society of Chemistry.

Author keywords:

Index keywords:

Crystal structure; Iron compounds; Nickel; Seebeck coefficient; Thermal expansion; Thermoelectricity; Annealing treatments; Lanthanum substitution; Nitrate precursor (Np); Oxygen non-stoichiometry; Si

DOI:

10.1039/c6ra13335e

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https://www.scopus.com/inward/record.uri?eid=2-s2.0-84981333787&doi=10.1039%2fc6ra13335e&partnerID=40&md5=162e807b381e84ad7803856da37319d1

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Link	https://www.scopus.com/inward/record.uri?eid=2-s2.0-84981333787&doi=10.1039%2fc6ra13335e&partnerID=40&md5=162e807b381e84ad7803856da37319d1
Affiliations	Department of Chemistry, Institute of Natural Sciences, Ural Federal University, Ekaterinburg, Russian Federation
Funding Details	16-33-00562, RFBR, Russian Foundation for Basic Research
Funding Text	This work was financially supported by RFBR (project No 16-33-00562).
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Correspondence Address	Kiselev, E.A.; Department of Chemistry, Institute of Natural Sciences, Ural Federal UniversityRussian Federation; email: Eugene.Kiselyov@urfu.ru
Publisher	Royal Society of Chemistry
CODEN	RSCAC
Language of Original Document	English
Abbreviated Source Title	RSC Adv.
Source	Scopus