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INFLUENCE OF SINTERING TEMPERATURE ON PHASE FORMATION AND OPTICAL PROPERTIES OF LEAD-FREE FERROELECTRIC BI0.5NA0.5TIO3 MATERIALS

Pb(Zr,Ti)O3 based ferroelectric materials have been widely used in electronic devices even though they were banned due to the toxicity of lead on health and environment. Among the leadfree ferromagnetic materials, Bi0.5Na0.5TiO3 has received much attention because their ferroelectric and piezoelectric characteristics are comparable to Pb(Zr,Ti)O3. In this report, Bi0.5Na0.5TiO3 was fabricated by sol-gel method. The influence of fabricating conditions such as gelization, sintering temperature on crystallinity was studied. The result showed that Bi0.5Na0.5TiO3 was in single phase when compenstation amount of Na in gelization is 40 mol%; sintering temperature higher than 800 o C and sintering time is 2 h. The bandgap of Bi0.5Na0.5TiO3 which estimated from absorption spectroscopy is in the range of 3.01 3.18 eV.