• Title/Summary/Keyword: Piezoelectric$Bi_2O_3$

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Electrical properties of (Na0.5K0.5)NbO3-BiTiO3 ceramics with the variation of sintering temperature

  • Lee, Tae-Ho;Lee, Sung-Gap
    • Journal of Ceramic Processing Research
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    • v.13 no.spc2
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    • pp.174-176
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    • 2012
  • Piezoelectric 0.93(Na0.5K0.5)NbO3-0.07BiTiO3 (NKN-BTO) ceramics were fabricated by the mixed-oxide method and their structural and dielectric properties was investigated with the variation of sintering temperature. All specimens were crystallized in the perovskite single phase without any formation of a second phase such as pyrochlore. The average grain size of the NKN-BTO specimen sintered at 1130 ℃ is 0.32 ㎛. The specimen sintered at 1100 ℃ showed the highest relative density of 98%. Electromechanical coupling factor, relative dielectric constant and dielectric loss of the NKN-BTO specimens sintered at 1110 ℃ were 0.31, 1222 and 0.02, respectively. Curie temperature of the specimen sintered at 1110 ℃ was 445 ℃.

Piezoelectric and Dielectric Characteristics of Low Temperature Sintering PMN-PNN-PZT Ceramics with the amount of WO3 Addition (저온소결 PMN-PNN-PZT 세라믹스의 WO3 첨가에 따른 압전 및 유전특성)

  • Yoo, Ju-Hyun;Kim, Kook-Jin;Lee, Seok-Tae
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.20 no.2
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    • pp.130-134
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    • 2007
  • In this study, in order to. develop the low temperature sintering ceramics for multilayer piezoelectric actuator, PMN-PNN-PZT ceramics using CuO, $Bi_{2}O_{3}\;and\;Li_{2}CO_{3}$ as sintering aids were manufactured with the amount of $WO_{3}$ addition. The ceramics were sintered at $900,\;930,\;960^{\circ}C$, respectively. Thereafter, their microstructural, dielectric and piezoelectric properties were investigated. The $WO_{3}$ was proved to lower the sintering temperature of piezoelectric ceramics due to the effects of PbO and $WO_{3}$ liquid phase. At 0.3 wt% $WO_{3}$ added specimen sintered at $930^{\circ}C$, electromechanical coupling factor($k_{p}$), mechanical quality factor($Q_{m}$), dielectric constant and $d_{33}$ showed the optimum values as the values of 0.60, 1,402, 1,440 and 360 pC/N, respectively, for multilayer piezoelectric actuator application.

Dielectric and Piezoelectric Properties of (Na,K,Li)(Nb,Ta,Sb)O3 Ceramics Manufactured Using Columbite Methods with Calcination Temperature (Columbite법으로 제조된 (Na,K,Li)(Nb,Ta,Sb)O3 세라믹스의 하소온도에 따른 유전 및 압전 특성)

  • Ra, Cheol-Min;Yoo, Ju-Hyun
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.29 no.3
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    • pp.159-163
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    • 2016
  • In this paper, in order to develop optimum composition ceramics with excellent piezoelectric properties, $(Na_{0.525}K_{0.443}Li_{0.037})(Nb_{0.823}Sb_{0.08}Ta_{0.037})O_3+0.3wt%Bi_2O_3+0.4wt%Fe_2O_3$ lead-free piezoelectric ceramics were synthesized by conventional soild-state method. The calcination temperature of columbite precursors were fabricated at temperature range from $950^{\circ}C$ to $1,150^{\circ}C$ and sintering aids with low melting point were added to densify these ceramics. Effect of calcination temperature on dielectric and piezoelectric properties of ceramics were investigated. the ceramics with B-site columbite precursors at temperature of $1,100^{\circ}C$ obtained the optimal values of $d_{33}=272$ [pC/N], $k_p=0.51$, $Q_m=102$, ${\varepsilon}_r=978$.

Calculation of Changed Optical Path Length of Bi12SiO20Single Crystal by the Electric Field (전기장에 의한 Bi12SiO20 단결정의 변화된 광행로길이 계산)

  • Lee, Su-Dae
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.18 no.11
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    • pp.1048-1055
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    • 2005
  • The formula to calculate a variation of optical path length of single crystal by the electric field was derived by this study. The formula was applied to $Bi_{12}SiO_{20}$ single crystal. The results are as follows. In case of the applied electric field in the body diagonal direction and the passing light along the same direction, the variation of optical path length had the largest value. The symmetry of the space distribution of optical path length satisfied $E3C_2\;8C_3$, the set of elements of the symmetry of $Bi_{12}SiO_{20}$ single crystal. The property which gave the largest influence to the variation of optical path length is the strain of length by the Inverse piezoelectric effect. The second influence, is the variation of the refractive index by the electro-optic effect. The variation of optical path length by the inverse piezoelectric effect and by the electro-optic effect have a reverse sign each other.

Effects of $Bi_2$$O_3$ additions on the dielectric and piezoelectric properties in Pb($Zr_{0.54}$, $Ti_{0.46}$)$O_3$ ($Bi_2$$O_3$첨가량이 Pb($Zr_{0.54}$, $Ti_{0.46}$)$O_3$의 유전, 압전특성에 미치는 영향)

  • 배이열;서동수
    • Electrical & Electronic Materials
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    • v.6 no.3
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    • pp.207-213
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    • 1993
  • Pb(Z $r_{0.54}$, $Ti_{0.46}$) $O_{3}$에 B $i_{2}$ $O_{3}$를 0.0wt%까지 첨가하여 미세구조, 유전, 압전, 성질에 미치는 영향을 고찰하였다. B $i_{2}$ $O_{3}$의 고용범위는 약 0.5~0.7wt%정도 이었고 B $i_{2}$ $O_{3}$ 첨가량이 증가함에 따라서 결정립의 크기가 감소하였다. B $i_{2}$ $O_{3}$첨가량이 증가함에 따라 고용한계까지는 $d_{33}$ , tan .delta., .xi.$_{r}$(분극후)값이 증가하였으며 Qm값과 밀도는 감소하였다. $K_{p}$ 값은 B $i^{3+}$ 가 P $b^{2+}$를 치환하므로 형성되는 Pb공공의 형성에 의해 자발분극이 증가됨에 따라 증가하였다.다.

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Effect of Ta-Substitution on the Ferroelectric and Piezoelectric Properties of Bi0.5/(Na0.82K0.18)0.5TiO3 Ceramics

  • Do, Nam-Binh;Lee, Han-Bok;Yoon, Chang-Ho;Kang, Jin-Kyu;Lee, Jae-Shin;Kim, Ill-Won
    • Transactions on Electrical and Electronic Materials
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    • v.12 no.2
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    • pp.64-67
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    • 2011
  • The effect of Ta substitution on the crystal structure, ferroelectric, and piezoelectric properties of $Bi_{0.5}(Na_{0.82}K_{0.18})_{0.5}Ti_{1-x}Ta_xO_3$ ceramics has been investigated. The Ta doping resulted in a transition from coexistence of ferroelectric tetragonal and rhombohedral phases to an electrostrictive pseudocubic phase, leading to degradations of the remnant polarization, coercive field, and piezoelectric coefficient $d_{33}$. However, the electricfield-induced strain was significantly enhanced by the Ta substitution-induced phase transition and reached a highest value of $S_{max}/E_{max}$ = 566 pm/V under an applied electric field 6 kV/mm when 2% Ta was substituted on Ti sites. The abnormal enhancement in strain was attributed to the pseudocubic phase with high electrostrictive constants.

A Study on the Low Temperature Sintering Piezoelectric Ceramics for Piezoelectric Actuator Application (압전 액츄에이터에 활용할 저온소결 압전 세라믹스에 관한 연구)

  • Ryu, Sung-Lim;Lee, Yu-Hyung;Lee, Sang-Ho;Yoo, Ju-Hyun
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2007.11a
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    • pp.277-278
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    • 2007
  • In this study, in order to develop multilayer piezo-actuator, PMN-PNN-PZT ceramics were fabricated using $Li_2CO_3,\;Na_2CO_3$, ZnO as sintering aids and their piezoelectric and dielectric properties were investigated according to the Bi substitution. Bi substitution enhanced electromechanical coupling factor$(k_p)$ and dielectric constant$({\varepsilon}_r)$. However, mechanical quality factor was deteriorated. At the sintering temperature of $870^{\circ}C$ and Bi substitution of 1mol%, density, electromechanical coupling factor$(k_p)$, mechanical quality factor$(Q_m)$, Dielectric constant$({\varepsilon}_r)$ and piezoelectric constant$(d_{33})$ of specimen showed the optimum value of $7.878g/cm^3$, 0.608, 835, 1603 and 397pC/N, respectively.

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Piezoelectric Characteristics of Lead-Free 0.74(Bi0.5Na0.5)TiO3-0.26SrTiO3 Ceramics According to Calcination Temperature (무연 0.74(Bi0.5Na0.5)TiO3-0.26SrTiO3 압전 세라믹스의 하소온도 변화에 따른 전기적 특성 변화)

  • Kim, Seong-Hyun;Lee, Sang-Hun;Han, Hyoung-Su;Lee, Jae-Shin
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.32 no.1
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    • pp.35-39
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    • 2019
  • In this study, we investigated the optimum calcination temperature of lead-free $0.74(Bi_{0.5}Na_{0.5})TiO_3-0.26SrTiO_3$(BNST) piezoelectric ceramics by analyzing the crystal structure, dielectric properties, and electric field-induced strain behavior. BNST ceramics prepared by conventional solid-state reaction methods at various calcination temperatures according to the industrial standard. All samples of BNST ceramics were subsequently sintered at $1,175^{\circ}C$ for 2 h. Crystal structure classification of the ceramics showed a single perovskite phase, with no second phase detectable for the samples calcined at $750^{\circ}C$ or higher. BNST samples calcined at $850^{\circ}C$ exhibited the most optimal values for itsand the common physical parameters of $density=5.518g/cm^3$, ${\varepsilon}=1,871.837$, $tan{\delta}=0.047$, and ${d_{33}}^*=874pm/V$.