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Among lead-free ferroelectric materials, the Bi0.5Na0.5TiO3 (BNT) materials have been paying more attention because they exhibit good ferroelectric and piezoelectric properties, making BNT materials become promising candidates to replace Pb(Zr,Ti)O3. In this work, the lead-free ferroelectric BNT materials were synthesized by sol-gel method. The effect of fabrication parameters on microstructural and optical properties was studied. | Communications in Physics, Vol. 26, No. 1 (2016), pp. 51-57 DOI:10.15625/0868-3166/26/1/7354 INFLUENCE OF FABRICATION CONDITIONS ON MICROSTRUCTURAL AND OPTICAL PROPERTIES OF LEAD-FREE FERROELECTRIC Bi0.5 Na0.5 TiO3 MATERIALS LE THI HAI THANH† , NGUYEN HOANG TUAN, LUONG HUU BAC, AND DANG DUC DUNG School of Engineering Physics, Hanoi University of Science and Technology PHUNG QUOC BAO Faculty of Physics, College of Science, Vietnam National University, Hanoi † E-mail: haithanh0609@gmail.com Received 29 October 2015 Accepted for publication 29 April 2016 Abstract. Lead-free ferroelectric materials have attracted considerable attention due to the increasing potential applications in environmentaly benign materials. Among lead-free ferroelectric materials, the Bi0.5 Na0.5 TiO3 (BNT) materials have been paying more attention because they exhibit good ferroelectric and piezoelectric properties, making BNT materials become promising candidates to replace Pb(Zr,Ti)O3 . In this work, the lead-free ferroelectric BNT materials were synthesized by sol-gel method. The effect of fabrication parameters on microstructural and optical properties was studied. These parameters include Na precursor concentration and calcination temperature. The results indicated that the Na precursor concentration higher 40 mol.% and calcining at temperatures in the region of 800-1000˚C for 2h in air were the best conditions to synthesize lead-free BNT materials. Keywords: lead-free, Bi0.5 Na0.5 TiO3 , optical properties, sol-gel. Classification numbers: 42.70.Mp; 81.20.Fw; 78.67.Bf. I. INTRODUTION Lead-free ferroelectric materials have attracted considerable attention due to increasing potential applications in environmentaly benign materials. The reason is that in the past decade the traditional ferroelectric materials, Pb(Zr,Ti)O3 (PZT), which contain a large amount of lead (∼ 60 wt.%), have caused environmental concerns, as well as inconsistent with governmental regulations c 2016 Vietnam .
