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http://dx.doi.org/10.3740/MRSK.2006.16.11.705

Nb-doping Effects on Ferroelectric and Piezoelectric Properties of Pb-free Bi0.5Na0.5  

Yeo, Hong-Goo (School of Nano & Advanced Materials Engineering, Changwon National University)
Sung, Yeon-Soo (School of Nano & Advanced Materials Engineering, Changwon National University)
Song, Tae-Kwon (School of Nano & Advanced Materials Engineering, Changwon National University)
Cho, Jong-Ho (School of Nano & Advanced Materials Engineering, Changwon National University)
Jeong, Soon-Jong (Korea Electrotechnology Research Institute, Electric and Magnetic Devices Research Group)
Song, Jae-Sung (Korea Electrotechnology Research Institute, Electric and Magnetic Devices Research Group)
Kim, Myong-Ho (Korea Electrotechnology Research Institute, Electric and Magnetic Devices Research Group)
Publication Information
Korean Journal of Materials Research / v.16, no.11, 2006 , pp. 705-709 More about this Journal
Abstract
Nb was doped to Pb-free $(Bi_{0.5}Na_{0.5})TiO_3$ (BNT) by a solid state mixing process to form $(Bi_{0.5}Na_{0.5})Ti_{1-x}Nb_xO_3\;(x=0{\sim}0.05)$ (BNTNb) and its doping effects on ferroelectric and piezoelctric properties of BNT were investigated. The BNTNb solid solutions were formed up to x=0.01 with no apparent second phases while grain sizes decreased. As x increased, coercive field ($E_c$) and mechanical quality factor ($Q_m$) decreased but piezoelectric constant ($d_{33}$) increased, which indicates Nb acts as a donor for BNT.
Keywords
bismuth sodium titanate; ferroelectric; P-E hysteresis loop; coercive field;
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