Evidence of phase heterogeneity in sol–gel Na0.5K0.5NbO3 system
作者： Anirban Chowdhury , Jonathan Bould , Michael G.S. Londesborough , Eva Večerníková , Steven J. Milne
DOI: 10.1016/J.MATCHEMPHYS.2010.06.009
关键词: Materials science 、 Niobium 、 Thermochemistry 、 Phase (matter) 、 Sol-gel 、 Ferroelectricity 、 Crystallography 、 Potassium 、 Analytical chemistry 、 Thin film 、 Crystallization
摘要: Abstract Na 0.5 K NbO 3 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 °C, but extra peaks indicated the presence secondary phase(s). The displayed non-ferroelectric polarisation hysteresis loops. Evidence phase heterogeneity was found from detailed analyses thermochemistry NKN precursor gels which showed multiple heating DTA exotherms for around 480–550 °C. Additionally, endotherms cooling 800–850 °C confirm second phase.
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