Synthesis, structural characteristics and dielectric properties of a new K2NiF4-type phase Sr2Mn0.5Ti0.5O4 / Chupakhina Т.I., Melnikova N.V., Gyrdasova О.I. // Journal of Alloys and Compounds. - 2016. - V. 670, l. . - P. 105-112.

ISSN:
09258388
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)O6 and SrO9. The dielectric properties of the ceramic samples are caused by structural and charge characteristics, regular coordination polyhedra SrО9 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. © 2016 Elsevier B.V.
Author keywords:
Chemical synthesis; Crystal structure; Dielectric properties; Impedance spectroscopy; X-ray diffraction
Index keywords:
нет данных
DOI:
10.1016/j.jallcom.2016.02.004
Смотреть в Scopus:
https://www.scopus.com/inward/record.uri?eid=2-s2.0-85006867203&doi=10.1016%2fj.jallcom.2016.02.004&partnerID=40&md5=601e92f0b3e367edd1980178093328b8
Соавторы в МНС:
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Link https://www.scopus.com/inward/record.uri?eid=2-s2.0-85006867203&doi=10.1016%2fj.jallcom.2016.02.004&partnerID=40&md5=601e92f0b3e367edd1980178093328b8
Affiliations Institute of Solid State Chemistry of the Ural Branch of the Russian Academy of Sciences, 91, Pervomaiskaya Str., Ekaterinburg, Russian Federation; Ural Federal University, 19, Mira Str., Ekaterinburg, Russian Federation
Author Keywords Chemical synthesis; Crystal structure; Dielectric properties; Impedance spectroscopy; X-ray diffraction
Funding Details 14-03-00103, RFBR, Russian Foundation for Basic Research; 16-02-00857, RFBR, Russian Foundation for Basic Research
Funding Text This work was financially supported by the Russian Foundation for Basic Research (Grants 14-03-00103 and 16-02-00857).
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Correspondence Address Chupakhina, Т.I.; Institute of Solid State Chemistry Russian Academy of Sciences, Urals Branch, Pervomaiskaya 91, Russian Federation; email: chupakhina@ihim.uran.ru
Publisher Elsevier Ltd
CODEN JALCE
Language of Original Document English
Abbreviated Source Title J Alloys Compd
Source Scopus