Interrelation of transport properties, defect structure and spin state of Ni3+ in La(1.2)Sr(0.8)Nio(0.9)Fe(0.1)O(4+delta) / Gilev A. R.,Kiselev E. A.,Zakharov D. M.,Cherepanov V. A. // SOLID STATE SCIENCES. - 2017. - V. 72, l. . - P. 134-143.

ISSN/EISSN:

1293-2558 / 1873-3085

Type:

Article

Abstract:

The total conductivity, Seebeck coefficient and oxygen non-stoichiometry for La1.2Sr0.8Ni0.9Fe0.1O4+delta have been measured vs temperature and oxygen partial pressure P(O-2). The measurements were carried out at 800, 850, 900 and 950 degrees C within the P(O-2) range of 10(-5)-0.21 atm. La1.2Sr0.8Ni0.9Fe0.1O4+delta was shown to be oxygen deficient in all temperature and P(O-2) ranges studied. The calculated values of the partial molar enthalpy of oxygen depend very slightly on oxygen content (8), indicating that La1.2Sr0.8Ni0.9Fe0.1O4+delta with the oxygen deficiency can be considered an ideal solution. The model of point defect equilibria in La1.2Sr0.8Ni0.9Fe0.1O4+delta has been proposed and fitted to experimental dependencies. Subsequent joint analysis of the defect structure and transport properties revealed that electron holes can coexist in both localized and quasi-delocalized states in the oxide: the former corresponded to high-spin state Ni3+ and the latter to low-spin state Ni3+. The mobilities of localized electron holes were shown to be significantly lower in comparison to quasi-delocalized ones. The behavior of localized electron holes was explained in terms of a small polaron conduction mechanism; in contrast, quasi-delocalized electron holes were described in terms of a band conduction approach. The small polaron conduction mechanism was shown to be predominant in the Sr- and Fe-co-doped lanthanum nickelate. (C) 2017 Elsevier Masson SAS. All rights reserved.

Author keywords:

La2Ni0.4; Defect structure; Spin state; Total conductivity; Seebeck coefficient; Hole mobility INTERSTITIAL OXYGEN DEFECT; K2NIF4 STRUCTURE; ELECTRICAL-PROPERTIES; MAGNETIC-PROPERTIES; CRYSTAL-STRUCTURE; METAL TRANSITION; NONSTOICHIOMETRY; LA2NIO4+DELTA; CONDUCTIVITY; OXIDES

DOI:

10.1016/j.solidstatesciences.2

Web of Science ID:

ISI:000411471700020

Соавторы в МНС:

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Другие поля

Поле	Значение
Month	OCT
Publisher	ELSEVIER SCIENCE BV
Address	PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
Language	English
EISSN	1873-3085
Keywords-Plus	INTERSTITIAL OXYGEN DEFECT; K2NIF4 STRUCTURE; ELECTRICAL-PROPERTIES; MAGNETIC-PROPERTIES; CRYSTAL-STRUCTURE; METAL TRANSITION; NONSTOICHIOMETRY; LA2NIO4+DELTA; CONDUCTIVITY; OXIDES
Research-Areas	Chemistry; Physics
Web-of-Science-Categories	Chemistry, Inorganic \& Nuclear; Chemistry, Physical; Physics, Condensed Matter
Author-Email	eugene.kiselyov@urfu.ru
ResearcherID-Numbers	Cherepanov, Vladimir/E-6451-2014
ORCID-Numbers	Cherepanov, Vladimir/0000-0003-3653-6459
Funding-Acknowledgement	Act 211 Government of the Russian Federation {[}02.A03.21.0006]; RFBR {[}16-33-00562]
Funding-Text	This work was financially supported by Act 211 Government of the Russian Federation, agreement No 02.A03.21.0006 and by RFBR (project No 16-33-00562). The work was performed using the equipment of the Ural Center for Shared Use ``Modern Nanotechnology{''} of the Ural Federal University.
Number-of-Cited-References	57
Usage-Count-Last-180-days	3
Usage-Count-Since-2013	3
Journal-ISO	Solid State Sci.
Doc-Delivery-Number	FH8SS