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http://dx.doi.org/10.3740/MRSK.2005.15.11.683

Dielectric and Piezoelectric Properties Of Lead-free (Bi0.5Na0.5)TiO3-BaTiO3 Ferroelectric Ceramics  

Kuk Min-Ho (School of Nano & Advanced Materials Engineering, Changwon National University)
Kim Myong-Ho (School of Nano & Advanced Materials Engineering, Changwon National University)
Cho Jung-A (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)
Bae Dong-Sik (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)
Publication Information
Korean Journal of Materials Research / v.15, no.11, 2005 , pp. 683-689 More about this Journal
Abstract
The structural, piezoelectric and ferroelectric properties of $(1-x)(Bi_{0.5}Na_{0.5})TiO_3$ x=0.00, 0.02, 0.04, 0.06, 0.08, and 0.10) ceramics were investigated. A gradual change in the crystal and microstructures with tile increase of $BaTiO_3$ (BT) concentration was observed. The $(Bi_{0.5}Na_{0.5})TiO_3$ (BNT) samples show unusual properties as ferroelectric relaxer materials. We observed a phase transition in BNT solid solutions with BT having normal ferroelectric phase transition. At room temperature, BNT presents a single phase without the morphotropic phase boundary (MPB). In the case of samples doped with $4\~8 mol\%$ BT, rhombohedral-tetragonal MPB was formed and the piezoelectric properties were improved.
Keywords
bismuth sodium titanate; phase transition; morphotropic phase boundary; BNT-BT solid solution;
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