Synthesis, structural characteristics and dielectric properties of a new K2NiF4-type phase Sr2Mn0.5Ti0.5O4

被引：8

作者：

Chupakhina, T. I. ^{[1
]}

Melnikova, N. V. ^{[2
]}

Gyrdasova, O. I. ^{[1
]}

机构：

[1] Russian Acad Sci, Inst Solid State Chem, Ural Branch, 91 Pervomaiskaya Str, Ekaterinburg, Russia

[2] Ural Fed Univ, 19 Mira Str, Ekaterinburg, Russia

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2016年 / 670卷

基金：

俄罗斯基础研究基金会;

关键词：

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

D O I：

10.1016/j.jallcom.2016.02.004

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

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.

引用

页码：105 / 112

页数：8

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