Browse > Article
http://dx.doi.org/10.4313/JKEM.2009.22.1.035

Effect According to Additive (Bi0.5Na0.5)TiO3 in BT-BNT System  

Lee, Mi-Jai (요업기술원 전자부품소재본부)
Paik, Jong-Hoo (요업기술원 전자부품소재본부)
Kim, Sei-Ki (요업기술원 전자부품소재본부)
Kim, Bit-Nam (요업기술원 전자부품소재본부)
Lee, Woo-Yong ((주)하이엘 연구소)
Lee, Kyung-Hee (명지대학교 신소재공학과)
Publication Information
Journal of the Korean Institute of Electrical and Electronic Material Engineers / v.22, no.1, 2009 , pp. 35-40 More about this Journal
Abstract
Lead free positive temperature coefficient of resistivity (PTCR) ceramics based on $BaTiO_3-(Bi_{0.5}Na_{0.5})TiO_3$ solid solution were prepared by a conventional solid state reaction method. The phase structure was showed single phase with perovskite structure regardless calcinations temperature and $Ba_{1-x}(Bi_{0.5}Na_{0.5})_xTiO_3$ structure was transformed from tetragonal to orthorhombic phase at $x{\geq}0.15$ mole. The XRD peaks with $45^{\circ}{\sim}46^{\circ}$ shifted in right the influence of crystal structure change and the intensity of peak was decreased with additive $(Bi_{0.5}Na_{0.5})TiO_3$. The curie temperature risen with additive $(Bi_{0.5}Na_{0.5})TiO_3$ but disappeared for $(Bi_{0.5}Na_{0.5})TiO_3$ addition more than 0.15 mole in TMA. In relative permittivity, the curie temperature by the transform of ferroelectric phase risen with additive $(Bi_{0.5}Na_{0.5})TiO_3$ but decreased in relative permittivity. Also, the peak of new curie temperature showed the sample containing $0.025{\sim}0.045$ mole of $(Bi_{0.5}Na_{0.5})TiO_3$ near $70^{\circ}C$ caused by phase transform from ferroelectric to ferroelectric and the peak of new curie temperature disappeared at 0.045 mole of $(Bi_{0.5}Na_{0.5})TiO_3$. In our study, it was found that the PTCR in $BaTiO_3-(Bi_{0.5}Na_{0.5})TiO_3$ system was possible for $0{\sim}0.025$ mole of $(Bi_{0.5}Na_{0.5})TiO_3$ and the maximum curie temperature by phase transition showed about at $145^{\circ}C$.
Keywords
PTC; Pb-free; Heater; $BaTiO_3$; $(Bi_{0.5}Na_{0.5})TiO_3$;
Citations & Related Records
연도 인용수 순위
  • Reference
1 Z. Yang, B. Liu, L. Wei, and Y. Hou, 'Structure and electrical properties of (1-x)$Bi_{0.5}Na_{0.5}TiO_{3}-xBi_{0.5}K_{0.5}TiO_{3}$ceramics near morphotropic phase boundary', Mat. Research Bull., Vol. 43, p. 81, 2008   DOI   ScienceOn
2 T. Takenaka and H. Nagata, 'Curent status and prospects of lead-free piezoelectric ceramics', J. Euro. Ceram. Soc., Vol. 25, p. 2693, 2005   DOI   ScienceOn
3 H. Takdea, W. Aoto, and T. Shiosaki, '$BaTiO_{3}-(Bi_{\frac{1}{2}}Na_{\frac{1}{2}})TiO_{3}$ solid-solution semiconducting ceramics with Tc> 130 ${^{\circ}C}$', Appl. Phys. Lett., Vol. 87, p. 102, 2005
4 김형욱, 김성철, 진병문, 안창원, 김일원, 김영혁, 이재신, '$Bi_{0.5}(Na_{1-x}K_{x})_{0.5}TiO_{3}$ 무연 세라믹의 유전 및 압전특성', 한국물리학회지, 53권, 1호, p. 56, 2006
5 W. Huo and Y Qu, 'Effect of $Bi_{1/2}Na_{1/2}TiO_{3}$ on the curie temperature and the PTC effects of Ba$TiO_{3}$-based positive temperature coefficient ceramics', Sensor and Acturators A, Vol. 128, p. 265, 2006   DOI   ScienceOn
6 J. shieh, K. C. Wu, and C. S. Chen, 'Switching characteristics of MPB compositions of $(Bi_{0.5}Na_{0.5})TiO_{3}-BaTiO_{3}-(Bi_{0.5}K_{0.5})TiO_{3}$ lead- free ferroelectric ceramics', Act. Mater., Vol. 55, p. 3081, 2007   DOI   ScienceOn
7 T. shimada, K. Touji, Y. Katsuyama, H. Takeda, and T. Shiosaki, 'Lead free PTCR ceramics and its electrical properties', J. Euro. Ceram. Soc., Vol. 27, p. 3877, 2007   DOI   ScienceOn
8 T. Takenaka, K. I. Maruyama, and K. Sakata, '$(Bi_{\frac{1}{2}}Na_{\frac{1}{2}})TiO_{3}-BaTiO_{3}$ system for lead-free piezoelectric ceramics', Japan. J. App. Phys., Vol. 30, No. 9B, p. 2236, 1991   DOI
9 Y. Luo, X. Liu, X. Li, and J. Cheng, 'PTCR effect in $BaBi_{2}Nb_{2}O_{9}$-doped $BaTiO_{3}$ ceramics', J. Mater Sci ; Mater Electron, Vol. 18, p. 883, 2007