Synthesis, structural characteristics and dielectric properties of a new K2NiF4-type phase Sr2Mn0.5Ti0.5O4 / Chupakhina T. I.,Melnikova N. V.,Gyrdasova O. I. // JOURNAL OF ALLOYS AND COMPOUNDS. - 2016. - V. 670, l. . - P. 105-112.

ISSN/EISSN:

0925-8388 / 1873-4669

Type:

Article

Abstract:

A new K2NiF4-type phase Sr2Mn0,5Ti0,5O4 have been synthesized by a sol-gel procedure and characterized by X-ray powder diffraction, thermogravimetric analysis and scanning electron microscopy. There are no oxide ion vacancies in these materials; oxidation states of manganese and titanium were estimated as +4. Rietveld profile analysis shows that the phase crystallizes with tetragonal unit cell in the space group I4/mmm. Substitution of Ti4+ for Mn4+ does not affect the distortion of coordination polyhedra (Mn, Ti)O-6 and SrO9. The dielectric properties of the ceramic samples are caused by structural and charge characteristics, regular coordination polyhedra SrO9 and lack of charge ordering, which can lead to significant permittivity. Increase of the dielectric constant at temperatures above 453 K is caused mainly by the grain boundary processes explained in terms of the Maxwell-Wagner polarization model. (C) 2016 Elsevier B.V. All rights reserved.

Author keywords:

Chemical synthesis; X-ray diffraction; Crystal structure; Impedance spectroscopy; Dielectric properties BOND-VALENCE PARAMETERS; PEROVSKITES; CERAMICS

DOI:

10.1016/j.jallcom.2016.02.004

Web of Science ID:

ISI:000371765800014

Соавторы в МНС:

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Другие поля

Поле	Значение
Month	JUN 15
Publisher	ELSEVIER SCIENCE SA
Address	PO BOX 564, 1001 LAUSANNE, SWITZERLAND
Language	English
EISSN	1873-4669
Keywords-Plus	BOND-VALENCE PARAMETERS; PEROVSKITES; CERAMICS
Research-Areas	Chemistry; Materials Science; Metallurgy \& Metallurgical Engineering
Web-of-Science-Categories	Chemistry, Physical; Materials Science, Multidisciplinary; Metallurgy \& Metallurgical Engineering
Author-Email	chupakhina@ihim.uran.ru
ResearcherID-Numbers	Melnikova, Nina/B-1601-2014
Funding-Acknowledgement	Russian Foundation for Basic Research {[}14-03-00103, 16-02-00857]
Funding-Text	This work was financially supported by the Russian Foundation for Basic Research (Grants 14-03-00103 and 16-02-00857).
Number-of-Cited-References	23
Usage-Count-Last-180-days	6
Usage-Count-Since-2013	20
Journal-ISO	J. Alloy. Compd.
Doc-Delivery-Number	DG0OY