• Title/Summary/Keyword: Piezoelectric ceramics

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Effect of Heating Rate and $V_2O_5$ Addition on Densification and Electrical Properties of $Pb(Mn_{1/3}Sb_{2/3})O_3-PZT$ Ceramics for Piezoelectirc Transformer (압전변압기용 $Pb(Mn_{1/3}Sb_{2/3})O_3-PZT$ 세라믹스에서 승온속도 및 $V_2O_5$ 첨가가 치밀화 및 전기적 특성에 미치는 영향)

  • 허수정;손준호;손정호;이준형;김정주;정우환;박명식;조상희
    • Journal of the Korean Ceramic Society
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    • v.37 no.4
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    • pp.295-301
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    • 2000
  • The effect of V2O5 addition on the low temperature sintering of Pb(Mn1/3Sb2/3)O3-PZT ceramics, which is known as a prominent material for piezoelectric transformer application was studied, and the densification behavior and piezoelectric characteristics of the samples as a function of heating rate were also examined. V2O5 led the system to liquid phase sintering by forming liquid phase during sintering, which accelerated densification through the particle rearrangement in the early stage of sintering. The liquid phase mostly existed at grain boundaries retarded the evaporation of PbO, while the densification temperature and the weight loss of V2O5-free samples were higher than those of samples with V2O5. Faster heating improved the densification of the samples regardless of V2O5 addition. The low temperature sintering at 100$0^{\circ}C$ was achieved in PMS-PZT ceramics with high density and reasonable dielectric and piezoelectric characteristics. This result revealed optimistic way to the development of multi-layered piezoelectric transformers.

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Microstructure and Piezoelectric Properties of PMW-PNN-PZT Ceramics with Bismuth Substitution (PMW-PNN-PZT 세라믹스의 Bismuth 치환에 따른 미세구조 및 압전 특성)

  • Kim, Yong-Jin;Yoo, Ju-Hyun;Shin, Dong-Chan
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.29 no.6
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    • pp.332-336
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    • 2016
  • In this study, in order to develop the composition ceramics for ultrasonic sensor with high $d_{33}*g_{33}$, $Pb_{1-3x/2}Bix(Mg_{1/2}W_{1/2})_{0.03}(Ni_{1/3}Nb_{2/3})_{0.09}(Zr_{0.5}Ti_{0.5})_{0.88}O_3$(PMW-PNN-PZT) system ceramics were prepared using CuO as sintering aids. And then, their microstructure, piezoelectric and dielectric characteristics were systemetically investigated with bismuth substitution. The PMW-PNN-PZT ceramic specimens could be sintered at sintering temperature of $940^{\circ}C$ by adding sintering aids. At x=0.015 specimen, the density, electromechanical coupling factor($k_p$), dielectric constant, piezoelectric constant($d_{33}$) and piezoelectric figure of merit($d_{33}*g_{33}$) indicated the optimal properties of $7.90g/cm^3$, 0.67, 2,511, 628 pC/N, and $17.7pm^2/N$, respectively, for duplex ultrasonic sensor application.

Piezoelectric Properties of PZW-PMN-PZT Ceramics for Energy Harvesting Devices (에너지하베스팅 소자용 PZW-PMN-PZT 세라믹의 압전특성)

  • Jeong, Yeong-Ho;Nam, Seok-Ho;Kim, Seung-Rae;Jung, Ju-Hyun;Yoo, Ju-Hyun;Lee, Kab-Su;Lee, Yu-Hyong
    • Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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    • 2009.05a
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    • pp.436-438
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    • 2009
  • In this study, in order to develop the composition of ceramics capable of being sintered at low temperature with high piezoelectric properties, PZW-PMN-PZT system ceramics for piezoelectric energy harvesting application were manufactured according to the amount of PZW addition. And also, their microstructural, dielectric and piezoelectric properties were investigated. At the sintering temperature of $930^{\circ}C$, a 5 mol% PZW substituted specimen showed a maximum value of density = $7.905g/cm^3$, kp = 0.585, $d_{33}$ = 351pC/N and Qm =1,254, respectively.

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Piezoelectric and dielectric properties of PMN-PZN ceramics for multilayer piezoelectric transformer with PZN substitution (PZN 치환에 따른 적층 압전변압기용 PMN-PZT 세라믹의 압전 및 유전 특성)

  • Lee, Chang-Bae;Yoo, Ju-Hyun;Paik, Dong-Soo;Im, In-Ho
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2005.07a
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    • pp.59-61
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    • 2005
  • In this paper, in order to develop the low temperature sintering ceramics for multilayer piezoelectric transformer, $Pb[(Mn_{1/3},Nb_{2/3})_{0.07}(Zn_{1/3}Nb_{2/3})_a(Zr_{0.48}Ti_{0.52})_{1-0.07-a}O_3]$ ceramics were manufactured with the variations of PZN from 2 to 14mol% and their dielectric and piezoelectric properties were investigated. Sintering temperature was varied from 910 to $1000^{\circ}C$. At 8mol% PZN substituted specimen sintered at $970^{\circ}C$, electromechanical coupling factor(kp), mechanical quality factor(Qm), dielectric constant and peizoelectric constant($d_{33}$) showed the optimal values of 0.536, 1803, 1551 and 328[pC/N), respectively, for multilayer piezoelectric transformer application.

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Dielectric and Piezoelectric Characteristics of $(Pb,Ca,Sr)Ti(Mn,Sb)O_3$ Ceramics with the amount of $Bi_2O_3$ addition ($Bi_2O_3$ 첨가량에 따른 $(Pb,Ca,Sr)Ti(Mn,Sb)O_3$ 세라믹스의 유전 및 압전특성)

  • Kim, Do-Hyung;Lee, Sang-Ho;Yoo, Ju-Hyun;Hong, Jae-Il
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2007.06a
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    • pp.292-293
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    • 2007
  • In the study, in order to develop low temperature sintering ceramics for multilayer piezoelectric transformer, $(Pb,Ca,Sr)Ti(Mn,Sb)O_3$ ceramics were fabricated using $Na_2CO_3$, $Li_2CO_3$, $MnO_2$ and $Bi_2O_3$ as sintering aids and their dielectric and piezoelectric properties were investigated according to the amount of $Bi_2O_3$ addition. At the sintering temperature of $900^{\circ}C$, density, thickness vibration mode electromechanical coupling factor ($k_t$), thickness vibration mode mechanical quality factor ($Q_{mt}$) and dielecteic constant (${\varepsilon}_r$) showed the optimum value of $6.94[g/cm^3]$, 0.497, 3,162 and 209, respectively, for multilayer piezoelectric transformer application.

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Device and Piezoelectric Characteristics of Pb(Mn1/3Sb2/3) O3-PZT Ceramics for Piezoelectric Transformer

  • Sohn, Joon-Ho;Heo, Soo-Jeong;Sohn, Jeong-Ho;Lee, Joon-Hyung;Jung, Woo-Hwan;Kim, Dong-Bum;Cho, Sang-Hee
    • The Korean Journal of Ceramics
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    • v.5 no.2
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    • pp.171-177
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    • 1999
  • In the $(Pb_{1-x}M_x)[(Mn_{1/3}Sb_{2/3})_{0.05}Zr_yTi_{0.95-y}]O_3$ system, where M=Ca and Sr, the piezoelectric properties were evaluated to examine the possibility of application to piezoelectric transformer. A Rosen-type piezoelectric transformer was formed, then the electrical properties of voltage step-up ratio, frequency characteristics etc. were analysed. The morphotropic phase boundary was determined to be y=0.475 in $Pb[(Mn_{1/3}Sb_{2/3})_{0.05}Zr_yTi_{0.95-y}]O_3$ system and the piezoelectric properties of this composition was kp=0.59, Qm=1600 and $\varepsilon_r$=1150. Moreover, when 1-2 mol% of Sr are substituted, enhanced piezoelectric properties of kp=0.61, Qm=1600 and $\varepsilon_r$=1400 were shown. The temperature rising (ΔT) of a piezoelectric transformer with $Pb[Mn_{1/3}Sb_{2/3})_{0.05}Zr_{0.475}Ti_{0.475})]O_3 $ composition was $10^{\circ}C$, and the voltage step-up ratio was 500 when the output voltage was 4000V, whereas the ΔT was below $3^{\circ}C$ and the resonant frequency variation ($\Delta f_r$) as a function of load resistance was below 5% when the output voltage was 2000 V. These characteristics are superior to the properties of materials, which were substituted by Ca or without substitution.

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Dielectric and Piezoelectric Properties of 0.95(Na0.5K0.5)0.04[(Nb0.8Ta0.20)0.994Co0.015]O3-0.05KNbO3 Ceramics as a Function of Calcination Temperature (하소온도 변화에 따른 0.95(Na0.5K0.5)0.04[(Nb0.8Ta0.20)0.994Co0.015]O3-0.05KNbO3 세라믹스의 유전 및 압전 특성)

  • Park, Min-Ho;Lee, Kab-Soo;Yoo, Ju-Hyun;Jeong, Woy-Seung
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.26 no.2
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    • pp.104-108
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    • 2013
  • In this paper, the $0.95(Na_{0.5}K_{0.5})_{0.04}[(Nb_{0.8}Ta_{0.20})_{0.994}Co_{0.015}]O_3$(abbreviated as NKNT) + $0.05KNbO_3$ lead-free piezoelectric ceramics were synthesized by the conventional mixed oxide method route with normal sintering. And also, the effects of calcination temperature on the microstructure, dielectric properties, and piezoelectric properties were investigated. A polymorphic phase transition(PPT) between orthorhombic and tetragonal phases was observed in specimens calcined at $810^{\circ}C{\sim}850^{\circ}C$. The ceramics calcined at $830^{\circ}C$ showed excellent piezoelectric properties: $d_{33}$= 179 pC/N, $k_p$= 0.384, $Q_m$= 79.73). These results indicate that the ceramic is a promising candidate material for lead-free piezoelectric ceramics.

Piezoelectric Properties of $Pb(Ni_{1/3}Nb_{2/3})O_{3}-PbZrO_{3}-PbTiO_{3}$ Ceramics doped with$Y_{2}O_{3}$ and Their Application to Multilayer Piezoelectric Actuators ($Y_{2}O_{3}$가 첨가된 $Pb(Ni_{1/3}Nb_{2/3})O_{3}-PbZrO_{3}-PbTiO_{3}$ 세라믹의 압전특성 및 적층형 압전 Actuator에 관한 연구)

  • Choi, Hae-Yun;Kwon, Jeong-Ho;Lee, Dae-Su;Kim, Il-Won;Song, Jae-Sung;Jeong, Soon-Jong;Lee, Jae-Shin
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2002.11a
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    • pp.317-321
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    • 2002
  • Piezoelectric properties of $(Pb_{1-x}Y_x)[(Ni_{1/3}Nb_{2/3})_{0.15}(Zr_{1/2}Ti_{1/2)})_{0.85}]O_{3}$ (x=0~0.05) ceramics were investigated, The stoichiometric PNN-PZT ceramics required the sintering temperature above $1100^{\circ}C$, but the addition of $Y_{2}O_{3}$ in the PNN-PZT ceramic lowered the sintering temperature down to $1000^{\circ}C$. In case of x=0.005, the electro-mechanical coupling $factor(K_p)$, the piezoelectric $constant(d_{33})$, and the maximum strain ratio of PNN-PZT ceramics sintered at $1000^{\circ}C$ were 53.1%, 395pC/N, and $2200{\times}10^{-6}$ respectively, A 30-layer piezoelectric actuator$(10{\times}10{\times}1.7mm)$ fabricated with the above material showed the maximum strain of $2.09{\mu}m$ under 100V DC bias.

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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.

Effect of Microstructure on Piezoelectric Properties and TCC Behavior in PZT-PZN Ceramics (PZT-PZN 세라믹의 미세구조가 압전 특성 및 TCC 거동에 미치는 영향)

  • Seo, Intae;Choi, Yongsu;Cho, Yuri;Kang, Hyung-Won;Kim, Kang San;Cheon, Chae Il;Han, Seung Ho
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.35 no.5
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    • pp.445-451
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    • 2022
  • Ultrasonic sensor is suitable as a next-generation autonomous driving assist device because its lower price compared to that of other sensors and its sensing stability in the external environment. Although Pb(Zr, Ti)O3 (PZT)-relaxor ferroelectric system has excellent piezoelectric properties, the change in capacitance is large in the daily operating temperature range due to the low phase transition temperature. Recently, many studies have been conducted to improve the temperature stability of ferroelectric ceramics by controlling the grain size and crystal structure, so it is necessary to study the effect of the grain size on the piezoelectric properties and the temperature stability of PZT-relaxor ferroelectric system. In this study, the piezoelectric properties, phase transition temperature, and temperature coefficient of capacitance (TCC) of 0.9 Pb(Zr1-xTix)O3-0.1 Pb(Zn1/3Nb2/3)O3 (PZTx-PZN) ceramics with various grain sizes were investigated. PZTx-PZN ceramics with larger grain size showed higher piezoelectric properties and temperature stability, and are expected to be suitable for ultrasonic devices in the future.