Evidence of phase heterogeneity in sol-gel Na0.5K0.5NbO3 system

被引：10
作者：
Chowdhury, Anirban [1 ]
Bould, Jonathan [1 ,2 ]
Londesborough, Michael G. S. [2 ]
Vecernikova, Eva [2 ]
Milne, Steven J. [1 ]
机构：
[1] Univ Leeds, Inst Mat Res, Leeds LS2 9JT, W Yorkshire, England
[2] Acad Sci Czech Republ, Inst Inorgan Chem, CZ-25068 Rez, Czech Republic
来源：
MATERIALS CHEMISTRY AND PHYSICS | 2010年 / 124卷 / 01期
关键词：
Thin films; Sol-gel growth; Ferroelectricity; Thermal properties; THIN-FILMS;
D O I：
10.1016/j.matchemphys.2010.06.009
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Na0.5K0.5NbO3 thin films have been synthesised via a sol-gel route using commercially available ethoxides of sodium, potassium and niobium. X-ray diffraction confirmed that film crystallisation occurred at >= 600 degrees C, but extra peaks indicated the presence of secondary phase(s). The thin films displayed non-ferroelectric polarisation hysteresis loops. Evidence of phase heterogeneity was found from detailed analyses of the thermochemistry of the NKN precursor gels which showed multiple heating DTA exotherms for crystallisation around 480-550 degrees C. Additionally, heating DTA endotherms and cooling exotherms for NKN gels around 800-850 degrees C confirm the presence of a second phase. (C) 2010 Elsevier B.V. All rights reserved.
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收藏
页码：159 / 162
页数：4
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