• Title/Summary/Keyword: Piezoelectric constant$(d_33)$

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Piezoelectric and Dielectric Properties of (Na,Li)$NbO_3$ Ceramics According to the $BaTiO_3$ substitution ($BaTiO_3$ 치환에 따른 (Na,Li)$NbO_3$ 세라믹스의 압전 및 유전특성)

  • Lee, Sang-Ho;Lee, Kab-Soo;Ryu, Ju-Hyun;Ryu, Sung-Lim;Song, Hyun-Seon
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2007.11a
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    • pp.272-273
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    • 2007
  • In this study, in order to develop the composition ceramics of lead-free ultrasonic motor, (Na,Li)$NbO_3-BaTiO_3$ ceramics were fabricated using a conventional mixed oxide process and their piezoelectric and dielectric characteristics were investigated according to the $BaTiO_3$, substitution. $BaTiO_3$ substitution enhanced density, dielectric constants$({\varepsilon}_r)$ and electromechanical coupling factor$(k_p)$. However, mechanical quality factor was deteriorated. At the $BaTiO_3$ substitution of 4mol%, density, electromechanical coupling factor$(k_p)$, dielectric constants$({\varepsilon}_r)$ and piezoelectric constant$(d_{33})$ of specimen showed the optimum value of $4.493g/cm^3$, 0.236, 175, 70pC/N, respectively.

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The Piezoelectric Properties of (Na0.5K0.5)NbO3-K5.4Cu1.3Ta10O29 Ceramics with Various K5.4Cu1.3Ta10O29 Doping and Sintering Temperatures

  • Yoon, Jung Rag;Lee, Chang-Bae;Lee, Serk Won;Lee, Heun-Young
    • Transactions on Electrical and Electronic Materials
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    • v.13 no.6
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    • pp.283-286
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    • 2012
  • (1-X)$(Na_{0.5}K_{0.5})NbO_3-XK_{5.4}Cu_{1.3}Ta_{10}O_{29}$ (NKN-KCT) lead-free piezoelectric ceramics have been synthesized by the conventional solid state sintering method, and their sinterability and piezoelectric properties were investigated. Typically, this material is sintered between 1,025 and $1,100^{\circ}C$ for 2 hours to achieve the required densification. Crystalline structures and Microstructures were analyzed by X-ray diffraction and scanning electron microscope. The density, dielectric constant (${\varepsilon}_r$), piezoelectric constant $d_{33}$, electromechanical coupling factor $k_p$ and mechanical quality factor $Q_m$ value of the NKN ceramics depended upon the KCT content and the sintering temperature. In particular, the KCT addition to NKN greatly improved the mechanical quality factor $Q_m$ value. The ceramic with X = 1.0 mol% sintered at $1,050^{\circ}C$ exhibited optimum properties (${\varepsilon}_r$=246, $d_{33}$=95, $k_p$=0.38 and $Q_m$=1,826). These results indicate that the ceramic is a promising candidate material for applications in lead free piezoelectric transformer and filter materials.

Piezoelectric and Dielectric Properties of NKN-(1-x)BNT-xBT Ceramics (NKN-(1-x)BNT-xBT 세라믹스의 압전 및 유전특성)

  • Lee, Seung-Hwan;Nam, Sung-Pill;Lee, Sung-Gap;Lee, Young-Hie
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.23 no.10
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    • pp.771-775
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    • 2010
  • In this study, piezoelectric and dielectric properties of the $(Na_{0.5}K_{0.5})NbO_3-(1-x)(Bi_{0.5}Na_{0.5})TiO_3-xBaTiO_3$ [NKN-(1-x)BNT-xBT] ceramics were investigated. The lead-free NKN-(1-x)BNT-xBT ceramics were fabricated by a conventional mixed oxide method. The results indicate that the addition of $BaTiO_3$ significantly influences the sintering, microstructure, phase transition and electrical properties of NKN-BNT ceramics. A gradual change in the piezoelectric and dielectric properties was observed with the increase of BT contents. The dielectric constant, piezoelectric constant ($d_{33}$) and electromechanical coupling factor ($k_p$) increased at the morphotropic phase boundary (MPB). The $d_{33}$=184 pC/N, $k_p$=0.38, dielectric constant=1455 with dielectric loss value of less than 1% were obtained for the NKN-0.95BNT-0.05BT ceramics sintered at $1150^{\circ}C$ for 2h. These results demonstrate that the NKN-(1-x)BNT-xBT ceramics is an attractive candidate for lead-free piezoelectric materials.

Piezoelectric and Dielectric Characteristics of Low Temperature Sintering PMN-PNN-PZT Ceramics according to the addition of dopant (불순물 첨가에 따른 저온소결 PMN-PNN-PZT 세라믹스의 압전 및 유전특성)

  • Lee, Sang-Ho;Lee, Chang-Bae;Jeong, Gwang-Hyeon;Yoo, Joo-Hyun;Hong, Jae-Il
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2005.11a
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    • pp.33-34
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    • 2005
  • In this study, in odor to develop low temperature sintering multilayer piezoelectric actuator and ultrasonic vibrator, PMN-PNN-PZT ceramics were fabricated using $Li_2CO_3$ and $Na_2CO_3$ as sintering aids and their piezoelectric and dielectric characteristics were investigated according to the addition of dopant CuO and $Fe_2O_3$, respectively. The CuO added PMN-PNN-PZT ceramics improved mechanical quality factor Qm due to the acceptor doping effect. And also, $Fe_2O_3$ reacted as softner in this composition system in addition to the increase of grain size and sinterability. Taking into consideration electromechanical coupling factor kp of 0.62, dielectric constant $\varepsilon_r$, of 1275, Piezoelectric $d_{33}$ constant of 377[pC/N] and mechanical quality factor Qm of 975, it was concluded that the ceramics with the $Fe_2O_3$, added composition sintered at 900[$^{\circ}C$] were best for the multilayer piezoelectric actuator and ultrasonic vibrator application.

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Piezoelectric properties of (Bi0.5Na0.5)TiO3-BaTiO3 ceramics prepared by reactive templated grain growth method (Reactive Templated Grain Growth법에 의해 제조된 (Bi0.5Na0.5)TiO3-BaTiO3 세라믹스의 압전 특성)

  • Ahn, Byung-Guk
    • Journal of Sensor Science and Technology
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    • v.16 no.3
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    • pp.234-239
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    • 2007
  • Crystallographically {h00}-oriented $0.94(Bi_{0.5}Na_{0.5})TiO_{3}-0.06BaTiO_{3}$ (0.94BNT-0.06BT) ceramics was prepared by the Reactive Templated Grain Growth (RTGG) method using the $Bi_{4}Ti_{3}O_{12}$ template. The sheets prepared by tape-casting of slurries containing the templates and starting materials are cut, laminated, and pressed. Then burn-out and sintering was conducted. Also, to compare with the 0.94BNT-0.06BT ceramics prepared by the RTGG method another 0.94BNT-0.06BT ceramics was prepared by the solid-state method. In the optimum of this experiments range, the degree of orientation of the 0.94BNT-0.06BT ceramics prepared by the RTGG method was texture fraction${\approx}92%$ and the piezoelectric constant($d_{33}$) and coupling factor($k_{p}$) was obtained to $d_{33}{\approx}205{\;}pC/N$, $k_{p}{\approx}0.33%$, respectively.

Microstructure and Piezoelectric Properties of PMN-PNN-PZT with the Sintering Temperature (소결온도에 따른 PMN-PNN-PZT 미세구조 및 압전특성)

  • Lee, Hyun-Seok;Yoo, Ju-Hyun;Yoon, Hyun-Sang
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2006.11a
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    • pp.217-218
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    • 2006
  • In this study, In order to develop the low temperature sintering multilayer piezoelectric actuator, PMN-PNN-PZT system ceramics were manufactured with the sintering temperature, and their microstructure and piezoelectric properties were investigated. At the composition ceramics sintered at $900^{\circ}C$, dielectric constant(${\varepsilone}_r$), electromechanical coupling factor($k_p$), piezoelectric constant($d_{33}$) and mechanical quality factor(Qm) showed the optimal value of 1095, 0.60, 363 and 1055, respectively, for multilayer piezoelectric actuator application.

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Microstructure and Ferroelectric Properties of Low Temperature Sintering PMN-PNN-PZT Ceramics with Sintering Temperature (저온소결 PMN-PNN-PZT세라믹스의 소결온도에 따른 미세구조 및 강유전특성)

  • Yoo, Ju-Hyun;Lee, Hyun-Seok;Lee, Sang-Ho
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.19 no.12
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    • pp.1118-1122
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    • 2006
  • In this study, in order to develop the low temperature sintering multilayer piezoelectric actuator, PMN-PNN-PZT system ceramics were manufactured and their microstructure, ferroelectric and piezoelectric properties were investigated. By increasing sintering temperature, remanent polarization$(P_r)$ was increased due to the increase of sinterability and grain size. However, coercive $field(E_c)$ showed an opposite tendency to remanent polarization owing to the feasibility of domain wall motion. At the sintering temperature of $900^{\circ}C$, dielectric $constant({\varepsilon}_r)$, electromechanical coupling $factor(k_p)$, piezoelectric $constant(d_{33})$ and mechanical quality $factor(Q_m)$ showed the optimal value of 1095, 0.60, 363 and 1055, respectively, for multilayer piezoelectric actuator application.

Piezoelectric and Dielectric Properties of PMN-PNN-PZT with the Sintering Temperature (소결온도에 따른 PMN-PNN-PZT 세라믹스의 압전 및 유전 특성)

  • Lee, Yu-Hyong;Yoo, Ju-Hyun;Lee, Sang-Ho;Yoon, Hyun-Sang;Ryu, Sung-Lim
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2007.11a
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    • pp.290-291
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    • 2007
  • In this study, in order to develop low temperature sintering ceramics for multilayer piezoelectric actuator, sensers, transducers, PMN-PNN-PZT ceramics were manufacrtured with the sintering temperature, and their piezoelectric and dielectric properties were investigated. At the composition ceramics sintered at $900^{\circ}C$, desity, dielectric constant$({\varepsilon}_r)$, electromechanical coupling factor(kp), piezoelectric constant$(d_{33})$ and mechanical quality factor(Qm) showed the optimal value of $7.86g/cm^3$, 1417, 0.634, 410pC/N and 1138, respectively.

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Fabrication and Electrical Characteristics of a hexagon-type piezoelectric transformer (육각형 압전변압기의 제조 및 전기적 출력 특성)

  • 이종필;홍진웅
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.17 no.5
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    • pp.149-153
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    • 2003
  • In this paper, a hexagon-type piezoelectric transformer was investigated to increase the output power. The length of its side was 14mm and 17.5[mm], respectively. The piezoelectric ceramics was composed to PZT-PMN-PSN. This composition showed the characteristics which had an about 1200 of the mechanical Q-factor, 0.55 of the electromechanical coupling coefficient, 320 x 10$\^$-12/ C/N of the piezoelectric constant d$\sub$33/, 0.3% of the dissipation factor, etc. The voltage step-up ratio increased with increasing the load resistance, Rt., so it reached 80 with R$\sub$L/ of l[M$\Omega$] and was proportion to the length of side of the hexagon-type piezoelectric transformer.

A Study on the Dielectric and Piezoelectric Properties of xPb($Y_{1/2}Ta_{1/2})O_3-(1-x)Pb(Zr_{0.52}Ti_{0.48})O_3$Ceramics (xPb($Y_{1/2}Ta_{1/2})O_3-(1-x)Pb(Zr_{0.52}Ti_{0.48})O_3$ 세라믹스의 유전 및 압전 특성에 관한 연구)

  • 강도원;김태열;김범진;김명호;박태곤
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 1999.11a
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    • pp.294-296
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    • 1999
  • Solid solution ceramics having various ratios between xPb( $Y_{1}$2/T $a_{1}$2/) $O_3$ and Pb(Z $r_{0.52}$ $Ti_{0.48}$) $O_3$were synthesized by a conventional solid state reaction for well sintered specimens, dielectric and piezoelectric prperties were studied as a function of composition. The dielectric constant of PYT-PZT ceramics of 4 mol% PYT was 1,424 at room temperature. The maximum value of electromechanical couping facotr $k_{p}$ of 51% $k_{t}$ of 30% were obtained at the composition of 4 mol% PYT, howerver mechanical quality factor( $Q_{m}$) had a minimum value of 69 at 4 mol% PYT. Also the maximum value of piezoelectric constant of $D_{33}$(310[pC/N]) and $d_{31}$(-131[pC/N]) were obtained at the composition of 4 mol% PYT content.ntent.t.t.t.

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