HYDROTHERMAL SYNTHESIS OF BATIO3 IN THE P RESENCE OF NO3- ION

Tetragonal BaTiO3 was prepared hydrothermally in alkaline aqueous solu tion of Ba(NO3)(2) and Ti(OC1H9)(4) at as low as 240 degrees C. The in fluence of alkalinity, nitrate ion, reactivity of titanium source and degree of fill on the formation particle sizes and morphologies was in vestigated by means of XRD, DSC and IR. The optimum KOH concentration was about 1.0 mol/L, in which BaTiO3 was the stablest phase among the family of BaO-TiO2. The nitrate ion played a positive role in the form atin and growth of BaTiO3 fine crystals. The higher the reactivity of titanium source and degree of fill is, the easier the formatin of tetr agonal BaTiO3 is.