• Title, Summary, Keyword: PMW-PNN-PZT

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Piezoelectric Characteristics of PMW-PNN-PZT Ceramics according to Post-Annealing Process (Post annealing에 따른 PMW-PNN-PZT 세라믹스의 압전 특성)

  • Yoo, Kyung-Jin;Yoo, Ju-Hyun;Park, Chang-Yub;Lee, Hyung-Gyu;Kang, Hyung-Won
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.212-213
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    • 2005
  • In this study, in order to develop low temperature sintering piezoelectric actuator, $Pb_{0.985}Bi_{0.01}(Mg_{1/2}W_{1/2})_{0.03}(Ni_{1/3}Nb_{2/3})_{0.13}(Zr_{0.50},Ti_{0.50})_{0.84}$ (PMW-PNN-PZT) ceramic systems were fabricated using $CaCO_3-Li_2CO_3$, sintering aid through a post-annealing process. The sinterability of PMW-PNN-PZT ceranics was remarkably enhanced by liquid phase sintering of $CaCO_3$ and $Li_2CO_3$. But, it was confimed form the X-ray diffraction pattern that the secondary phase along grain boundaries, deteriorated the piezoelectric properties. The secondary phase along grain boundaries was significantly removed by annealing after sintering. The 0.2wt% $Li_2CO_3$-0.25wt% $CaCO_3$-added PMW-PNN-PZT ceramics post-annealed at 900$^{\circ}C$ for 90min exhibited the excellent electromechanical coupling factor($k_p$) of 63.3% and piezoelectric constant($d_{33}$) of 452pC/N, respectively, for multilayer piezoelectricactuatorapplication.

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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.

Microstructure and Piezoelectric Properties of Low Temperature Sintering PMW-PNN-PZT-BF Ceramics According to PNN Substitution (PNN 치환에 따른 PMW-PNN-PZT-BF 세라믹스의 미세구조와 압전 특성)

  • Sin, Sang-Hoon;Yoo, Ju-Hyun
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.29 no.2
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    • pp.90-94
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    • 2016
  • In this work, [$Pb(Mg_{1/2}W_{1/2})_{0.03}(Ni_{1/3}Nb_{2/3})_x(Zr_{0.5}Ti_{0.5})_{0.97-x}O_3-BiFeO_3$] (x=0.02 to 0.12) composition ceramics were fabricated by the conventional soild state reaction method and their microstructure and piezoelectric properties were investigated according to PNN substitution. The addition of small amount of $BiFeO_3$, $Li_2CO_3$, and $CaCO_3$ were used in order to decrease the sintering temperature of the ceramics. The XRD (x-ray diffraction patterns) of all ceramics exhibited a perovskite structure. The sinterability of PMW-PNN-PZT-BF ceramics was remarkably improved using liquid phase sintering of $CaCO_3$, $Li_2CO_3$. However, it was identified from of the X-ray diffraction patterns that the secondary phase formed in grain boundaries decreased the piezoelectric properties. According to the substitution of PNN, the crystal structure of ceramics is transformed gradually from a tetragonal to rhombohedral phase. The x=0.10 mol PNN-substituted PMW-PNN-PZT-BF ceramics sintered at $920^{\circ}C$ showed the optimum values of piezoelectric constant($d_{33}$), piezoelectric figure of merit($d_{33{\cdot}}g_{33}$), planar piezoelectric coupling coefficient($k_p$) and density : $d_{33}=566$ [pC/N], $g_{33}=29.28[10^{-3}mV/N]$, $d_{33{\cdot}}g_{33}=16.57[pm^2/N]$, $k_p=0.61$, density=7.82 [$g/cm^3$], suitable for duplex ultrasonic sensor application.

Piezoelectric Characteristics of PMW-PNN-PZT Ceramics for Actuator Application (액츄에이터용 PMW-PNN-PZT 세라믹스의 압전특성)

  • Yoo, Kyung-Jin;Yoo, Ju-Hyun;Yoon, Hyun-Sang;Park, Chang-Yeop;Jeong, Yeong-Ho;Lee, Hyung-Gyu;Kang, Hyung-Won
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.332-333
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    • 2005
  • In this study, in order to develop low temperature sintering piezoelectric actuator, $Pb(Mg_{1/2}W_{1/2})_{0.03}(Ni_{1/3}Nb_{2/3})_x(Zr_{0.50},Ti_{0.50})_{1-x-0.03}$ (PMW-PNN-PZT) ceramic systems were fabricated using $CaCO_3-Li_2CO_3$ sintering aid and their dielectric and piezoelectric properties were investigated with the variation of PNN substitution. The piezoelectric actuator requires high piezoelectric constant $d_{33}$ and high electromechanical coupling factor kp. At the PMW-PNN-PZT ceramics with 9mol% PNN substitution sintered at $900^{\circ}C$, the density, electromechanical coupling factor kp, dielectric constant, piezoelectric constant $d_{33}$ and mechanical quality factor Qm showed the excellent values of 7.86 [$g/cm^3$], 0.584, 1881, 485 [pC/N] and 76, respectively for piezoelectric actuator application.

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Dielectric and Piezoelectric Properties of Low Temperature Sintering PMW-PNN-PZT Substituted with CeMnO3 (CeMnO3가 치환된 저온소결 PMW-PNN-PZT 세라믹스의 유전 및 압전 특성)

  • Kim, Yong-Jin;Yoo, Ju-Hyun
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.28 no.3
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    • pp.160-164
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    • 2015
  • In this study, $(1-x)Pb(Mg_{1/2}W_{1/2})_{0.03}(Ni_{1/3}Nb_{2/3})_{0.09}(Zr_{0.5}Ti_{0.5})_{0.88}O_3+xCeMnO_3$ (x= 0~0.02) ceramics were prepared by Columbite precursor method. The phase structure, ferroelectric and piezoelectric properties were systematically investigated. It was found that PMW-PNN-PZT possessed superior electrical properties due to its composition close to the MPB (morphotropic phase boundary). Coercive electric field of 10.05 [kV/cm] and density of 7.88 [$g/cm^3$] were obtained when the substitution amount of $CeMnO_3$ is x=0.02. In contrast, specimens with x=0.01 showed the mechanical quality factor($Q_m$) of 1,091 and the electromechanical coupling factor($k_p$) of 0.613.

발전소자응용을 위한 PMW-PNN-PZT적층 압전세라믹스의 특성

  • O, Yeong-Gwang;Ryu, Ju-Hyeon;Mun, Seung-Eon
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.78-78
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    • 2009
  • In this study, multilayer piezoelectric ceramics was manufactured using the PMW-PNN-PZT ceramics. Then, their physical characteristics for applicaton of electric power generation were investigated according to the numbers of multilayer. With increasing the numbers of multilayer, effective electromechanical coupling factor($k_{eff}$) and capacitance were decreased and increased, respectively.

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Low-Temperature Sintering and Dielectric Properties of PMW-PNN-PZT ceramics (PMW-PNN-PZT계 세라믹의 저온 소결 및 유전특성에 관한 연구)

  • Shin, Hea-Kyoung;Han, Sang-Hwa;Bae, Seon-Gi
    • Proceedings of the KIEE Conference
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    • pp.70-71
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    • 2004
  • In this paper, in order to develop the low temperature sintering and dielectric properties for piezoelectric transformer, PMW-PNN-PZT ceramics using $B_2O_3$ as sintering aids were manufactured. With increasing the amount of $B_2O_3$ addition, density were increased up to 10mol% $B_2O_3$ addition and then decreased. The variation rate of dielectric constant according to the change of frequency were decreasing by increasing frequency, and in the sintering $1100^{\circ}C$, 20mol% $B_2O_3$ showed $1.32{\times}10^{-1}/kHz$.

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Low-Temperature Sintering and piezoelectric Properties of PMW-PNN-PZT ceramics (PMW-PNN-PZT계 세라믹의 저온 소결 및 압전특성에 관한 연구)

  • Shin, Hye-Gyeong;Bak, Seong-U;Seong, Nak-Jin;Bae, Seon-Gi
    • Proceedings of the KIEE Conference
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    • pp.1906-1908
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    • 2005
  • In this study, in order to develop the low temperature sintering ceramics, PMW-PNN-PZT ceramics adding CuO, $B_2O_3$ were manufactured, and their piezoelectric properties is investigated. The results of this study were gotten such as follows. The electromechanical coupling coefficient(kp) showed good properites on the whole, showed its maximum value 36.88 in specimens sintered at $900[^{\circ}C]$, 10[mol%] $B_2O_3$. The mechanical quality coefficient(Qm) showed its maximum value 161.601 in specimens sintered at $1100[^{\circ}C]$, 15[mol%] $B_2O_3$.

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Ferroelectric and Piezoelectric Properties of PMW-PNN-PZT Ceramics as a Function of BiFeO3 Substitution (BiFeO3 치환에 따른 PMW-PNN-PZT세라믹스의 강유전 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.28 no.9
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    • pp.577-580
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    • 2015
  • In this paper, in order to develop the composition ceramics with the outstanding piezoelectric properties, $Pb(Mg_{1/2}W_{1/2})_{0.03}(Ni_{1/3}Nb_{2/3})_{0.09}(Zr_{0.5}Ti_{0.5})_{0.88}O_3$ ceramics substituted with $BiFeO_3$ were prepared by the conventional solid-state reaction method. The addition of small amount of $Li_2CO_3$ and $CaCO_3$ as sintering aids decreased the sintering temperature of the ceramics. The effects of $BiFeO_3$ substitution on their piezoelectric and dielectric properties were investigated. when 0.015 mol $BiFeO_3$ was substituted, the optimal physical properties of $d_{33}=590pC/N$, $E_c=8.78kV/mm$ were obtained.