tailieunhanh - Influence of sintering temperature on phase formation and optical properties of lead free ferroelectric BI0.5NA0.5TIO3 materials

The influence of fabricating conditions such as gelization, sintering temperature on crystallinity was studied. The result showed that was in single phase when compenstation amount of Na in gelization is 40 mol%; sintering temperature higher than 800 oC and sintering time is 2 h. The bandgap of which estimated from absorption spectroscopy is in the range of - eV. | Journal of Science and Technology 54 (1A) (2016) 104-111 INFLUENCE OF SINTERING TEMPERATURE ON PHASE FORMATION AND OPTICAL PROPERTIES OF LEAD-FREE FERROELECTRIC MATERIALS Le Thi Hai Thanh1, 3, Dang Ba Tung1, Nguyen Hoang Viet2, Luong Huu Bac1, Phung Quoc Bao3, Nguyen Hoang Tuan1, and Dang Duc Dung1, * 1 School of Engineering Physics, Ha Noi University of Science and Technology, 1 Dai Co Viet road, Ha Noi, Viet Nam 2 School of Materials Science and Engineering, Hanoi University of Science and Technology, 1 Dai Co Viet road, Ha Noi, Viet Nam 3 Department of Quantum Optics, Faculty of Physics, VNU University of Science, 334 Nguyen Trai road, Ha Noi, Viet Nam * Email: Received: 24 October 2015; Accepted for publication: 30 November 2015 ABSTRACT 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, has received much attention because their ferroelectric and piezoelectric characteristics are comparable to Pb(Zr,Ti)O3. In this report, was fabricated by sol-gel method. The influence of fabricating conditions such as gelization, sintering temperature on crystallinity was studied. The result showed that was in single phase when compenstation amount of Na in gelization is 40 mol%; sintering temperature higher than 800 oC and sintering time is 2 h. The bandgap of which estimated from absorption spectroscopy is in the range of - eV. Keywords: , sol-gel, optical properties, lead-free, ferroelectric. 1. INTRODUCTION Pb(Zr,Ti)O3 based ferroelectric materials (PZT) have been widely used in daily life, science and technology [1]. Although PZT has good ferroelectric and piezoelectric characteristics, PZTbased materials have a serious problem due to the high amount of Pb (60 %) which can .