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Evidence of phase heterogeneity in sol-gel Na0.5K0.5NbO3 system
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SYSNO ASEP 0357038 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Evidence of phase heterogeneity in sol-gel Na0.5K0.5NbO3 system Author(s) Chowdhury, A. (GB)
Bould, Jonathan (UACH-T) SAI, RID, ORCID
Londesborough, Michael Geoffrey Stephen (UACH-T) SAI, RID, ORCID
Večerníková, Eva (UACH-T) SAI
Milne, S.J. (GB)Source Title Materials Chemistry and Physics. - : Elsevier - ISSN 0254-0584
Roč. 124, č. 1 (2010), s. 159-162Number of pages 4 s. Language eng - English Country CN - China Keywords thin films ; sol-gel growth ; ferroelectricity ; thermal properties Subject RIV CA - Inorganic Chemistry CEZ AV0Z40320502 - UACH-T (2005-2011) UT WOS 000282607900035 DOI 10.1016/j.matchemphys.2010.06.009 Annotation 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 Workplace Institute of Inorganic Chemistry Contact Jana Kroneislová, krone@iic.cas.cz, Tel.: 311 236 931 Year of Publishing 2011
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