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Evidence of phase heterogeneity in sol-gel Na0.5K0.5NbO3 system
- 1.0357038 - ÚACH 2011 RIV CN eng J - Journal Article
Chowdhury, A. - Bould, Jonathan - Londesborough, Michael Geoffrey Stephen - Večerníková, Eva - Milne, S.J.
Evidence of phase heterogeneity in sol-gel Na0.5K0.5NbO3 system.
Materials Chemistry and Physics. Roč. 124, č. 1 (2010), s. 159-162. ISSN 0254-0584. E-ISSN 1879-3312
Institutional research plan: CEZ:AV0Z40320502
Keywords : thin films * sol-gel growth * ferroelectricity * thermal properties
Subject RIV: CA - Inorganic Chemistry
Impact factor: 2.356, year: 2010
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
Permanent Link: http://hdl.handle.net/11104/0006365
Number of the records: 1