• Electrical & Electronic Materials
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• 제10권2호
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• pp.134-140
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• 1997

PbTiO$_{3}$-PbZrO$_{3}$-Pb(Ni$_{1}$3/Nb $_{2}$3/O$_{3}$)(PZT-PNN) thin films were prepared from corresponding metal organics partially stabilized with diethanolamine by the sol-gel spin coating method. Each mol rates of PT:PZ:PNN solutions were #1(50:40:10), #2(50:30:20), #3(45:35:20) and #4(40:40:20), respectively. The spin-coated PZT-PNN films were sintered at the temperature from 500.deg. C to 600.deg. C for crystallization. The P-E hysteresis curve was drawn by Sawyer-Tower circuit with PZT-PNN film. The coercive field and the remanent polarization of #4(40:40:20 mol%) PZT-PNN film were 28.8 kV/cm and 18.3 .mu.C/cm$^{2}$, respectively. Their dielectric constants were shown between 128 and 1120, and became maximum value in MPB(40:40:20 mol%). The leakage currents of PZT-PNN films were about 9.4x 10$^{-8}$ A/cm$^{2}$, and the breakdown voltages were about 0.14 and 1.1 MV/cm. The Curie point of #3(45:35:20 mol%, sintered at 600.deg. C) film was 330.deg. C.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 한국전기전자재료학회 2008년도 하계학술대회 논문집 Vol.9
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• pp.330-330
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• 2008

$Fe_2O_3$ added Pb$(Ni_{1/3}Nb_{2/3})O_3-PbTiO_3-PbZrO_3 $ (PNN-PT-PZ) ceramics were produced in order to use them as a bimoph acturator for energy harvesting. Especially, the 0.25 wt% $Fe_2O_3$ added 0.4PNN-0.357PT-0.243PZ, having the composition of morphotropic phase boundary, showed good piezoelectric properties of $d_{33}$ of 810 pC/N, $k_p$ of 77% and $Q_m$ of 55 along with a high Curie temperature of $210^{\circ}C$. A bimorph actuator, composed of the two piezoelectric layers bonded together with a phosphorous bronze layer as a central metallic electrode, was successfully fabricated. The bimorph actuator, vibrated with a 1.3 mm amplitude at 68 Hz, produced high electric power of approximately 60 mW.

• Journal of the Korea Academia-Industrial cooperation Society
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• 제12권1호
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• pp.390-395
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• 2011

In order to develope piezoelectric transformer for the ballast of fluorescent lamp, the composition of piezoelectric ceramics was 0.95Pb($Zr_xTi_{1-x}$)O3+yPb($Mn_{1/3}Nb_{2/3}$)$O_3$+(0.05-y)Pb($Sb_{1/2}Nb_{1/2}$)$O_3$. PMN compound was selected to improve mechanical quality factor and PSN to prevent the decrease of dielectric constant and electromechanical coupling coefficient. Dielectric and piezoelectric characteristics in the region of MPB of 0.95Pb($Zr_xTi_{1-x}$)$O_3$+yPb($Mn_{1/3}Nb_{2/3}$)$O_3$+(0.05-y)Pb($Sb_{1/2}Nb_{1/2}$)$O_3$ ceramics was discussed both quantatively and qualitatively.

• Journal of the Korean Ceramic Society
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• 제42권10호
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• pp.698-702
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• 2005

Dielectric and Piezoelectric properties of complex perovskite 0.92Pb($Zr_{1/2}Ti_{1/2})O_{3}-(0.08-x)Pb(Cu_{1/3}Nb_{2/3})O_{3}-xPb(Mn_{1/3}Nb_{2/3})O_{3}(0{\leq}x{\leq}0.080$) (PZT-PCN-PMN) system were investigated as a function of PMN content. With the increase of PMN content of the sintered specimens, tetragonal phase was coexisted with rhombohedral phase, the dielectric constant was decreased, mechanical quality factor ($Q_{m}$) was inceased, and optimal sintering temperature was increased up to 1050$^{\circ}C$. For the composition of x = 0.064 sintered at 1050$^{\circ}C$ for 2 h, 1939 of maximum mechanical quality factor ($Q_{m}$), 57$\%$ of electromechanical coupling factor ($k_{p}$), and 1100$^{\circ}C$ of dielectric constant, 0.37$\% $ of dielectric loss (tan $\delta$) were obtained.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 한국전기전자재료학회 1999년도 추계학술대회 논문집
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• pp.269-272
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• 1999

In this study, electrical properties and TCFr of Pb(Sb$_{1}$2/Nb$_{1}$2/)O$_3$-Pb(Mn $_{1}$3/Nb$_{2}$3/)O$_3$-Pb(zr, Ti)O$_3$ composition ceramics were investigated wish the Zr/Ti ratio and the additions of Y2O3. and Fe$_2$O$_3$ Electromechanical coupling factor(Kp) showed the highest value of 0.555 in the Zr/Ti=0.50/0.50 ratio ,however, dielectric constant showed the highest value of 1,217 in the Zr/Ti = 0.49/0.51 ratio. Excellent TCFr vague of 421ppm/$^{\circ}C$] at-30~9O$^{\circ}C$ was appeared in the Zr/Ti=0.50/0.50 ratio and electro-mechanical coupling factor(Kp) , mechanical quility factor(Qm) and dielectric constant was 0.496, 1,286 and 1,085 ,respectively ,in the composition ceramics of lwt%Y$_2$O$_3$ and 0.3wt%Fe$_2$O$_3$.

• Proceedings of the KIEE Conference
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• 대한전기학회 1994년도 추계학술대회 논문집 학회본부
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• pp.193-195
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• 1994

In this study, the structural, dielectric and piezoelectrical properties of $xPb(Mg_{1/2}W_{1/2})O_3-(1-x)[0.41Pb(Ni_{1/3}Nb_{2/3})O_3-0.36PbTiO_3-0.23P Zr)_3]$ (x=0, 0.01, 0.02, 0.03, 0.04, 0.05) system ceramics were investigated. The dielectric constant ${\varepsilon_{33}}^{\tau}$ at loon temperature increased up to 3mol% PMW and decreased with further PMW content. The specimen with 1mol% $Pb(Mg_{1/2}W_{1/2})O_3$, which has the ${\varepsilon_{33}}^{\tau}=5509$, kp=59[%] and $d_{33}=758{\times}10^{-12}[C/N]$, exhibits good characteristics.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 한국전기전자재료학회 2005년도 추계학술대회 논문집 Vol.18
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• pp.27-28
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• 2005

본 연구에서는$Cr_2O_3$ 와 $Nb_2O_5$ 를 첨가한 $Pb(Zr_{0.54}Ti_{0.48})O_3$ 세라믹스에서 $Nb_2O_5$ 첨가량에 따른 소결 및 압전, 유전특성을 조사하였다. $Pb(Zr_{0.54}Ti_{0.48})O_3$ + 0.2 wt% $Cr_2O_3$ + wt% $Nb_2O_5$ ($0.{\sim}2wt.%$)의 첨가량에 따른 압전, 유전특성 및 미세구조에 관해 연구하였다. 본조성에서 $Nb_2O_5$ 첨가량이 증가함에 따라 입경의 크기는 증가하였으며, 0.5 wt% $Nb_2O_5$ 첨가조성에서 $4\sim5\mu m$의 최대 평균입경을 보이다가 그 이상의 첨가 조성에서 급격히 감소하였다. 유전상수와 kp 는 $Nb_2O_5$ 첨가량이 1.0 wt% 조성까지 증가하였다가 그 이상 조성에서 감소하였다. $Nb_2O_5$ 첨가량이 증가함에 따라 삼방정(rhombohedral)구조에서 정방정(tetragonal)구조로 상전이 일어났으며, 본 조성의 상경계 영역인 0.5 wt% 조성에서 $\varepsilon_r$ = 730, $k_p$ = 0.72, $d_{33}$ = 450, $g_{33}$ = 70의 우수한 압전 특성을 나타내었다. 이러한 조성은 접촉센서용 복합압전소재의 실용가능성을 제시하였다.

• Transactions on Electrical and Electronic Materials
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• 제6권5호
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• pp.202-209
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• 2005

Phase evolution, microstructure and the electrical properties such as $k_p$ and $Q_m$ of $Pb(Mg_{1/3}Nb_{2/3})O_3[PMN]-Pb(Mn_{1/3}Nb_{2/3})O3[PM'N]-PbZrO_3[PZ]-PbTiO_3[PT]$ quaternary system were investigated within the compositional ranges $0{\leq}y{\leq}0.125$, y+z=0.125, and $0.39{\leq}x{\leq}0.54$ of the formula $Pb_{0.97}Sr_{0.03}[Mg_{1/3}Nb_{2/3})_y\;(Mn_{1/3}Nb_{2/3})_z\;(Zr_{x}Ti_{1-x})_{1-(y+z)}]O_3$. In the case of increasing Mn/(Mg+Mn) ratio for a fixed Zr/Ti ratio of 47.5/52.5, phase relation remained unchanged but the grain size drastically decreased, and the electrical properties changed as following: both $k_P$ and $Q_m$ reached the peak values at $Mn/(Mg+Mn)\cong0.3l7$ and gradually decreased; $\varepsilon33^T$ showed a monotonic decrease; P-E hysteresis loop gradually changed to asymmetrical one, and $E_i$ increased in correspondence. With increasing Zr/Ti ratio for a fixed Mn/(Mg+Mn) ratio of 0.317, on the contrary, the cell parameter $(\alpha^2c)^{1/3}$ gradually increased, and tetragonal-rhombohedral morphotropic phase boundary appeared in the range of $51/49{\leq}Zr/Ti{\leq}54/46$. the meantime, the grain size substantially increased, and the electrical properties changed as following: $k_P$ and $\varepsilon33^T$ reached peak values at Zr/Ti=51/49 and 48/52, respectively, and then gradually decreased; change of $Q_m$ was adverse to $k_P$; both $E_C\;and\;E_i$ considerably decreased while $P_S$ moderately increased. For the system 0.125(PMN+PM'N)-0.875PZT studied, the composition Mn/(Mg+Mn)=0.3l7 and Zr/Ti=51/49 revealed some promising electrical properties for piezoelectric transformer application such as $k_P=0.58,\;Q_m\cong1000$, and $\varepsilon^T_{33}=970$, as well as dense and fine-grained microstructure.

• Journal of the Korean Ceramic Society
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• 제38권1호
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• pp.56-60
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• 2001

90.24 mol% ZrO$_2$-5.31 mol% $Y_2$O$_3$-4.45 mol% Nb$_2$O$_{5}$ 조성의 (Y,Nb)-TZP와 (Y,Nb)-TZP/Al$_2$O$_3$복합체를 155$0^{\circ}C$~1$600^{\circ}C$에서 1~2시간 소결하여 제조하였다. 시편의 결함에 대한 저항성을 조사하기 위하여 R-curve, Weibull modulus, slow crack growth 변수 등을 조사하였다. 실험결과, (Y,Nb)-TZP와 (Y,Nb)-TZP/Al$_2$O$_3$복합체 모두 상용 3Y-TZP 보다 우수한 결함 저항성이 관찰되었다. (Y,Nb)-TZP/Al$_2$O$_3$복합체의 결함 저항성은 $Al_2$O$_3$첨가에 의한 결정립 가교 인화, 분산강화, R-curve 효과에 의한 것으로 추정된다.

• Journal of the Korean Ceramic Society
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• 제23권1호
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• pp.60-66
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• 1986

The effect of composition size of sintered body and electrode on resonant characteristics of the system $Pb(Mn_{1/3}Nb_{2/3})O_3 PbTiO_3-PbZrO_3$ has been decribed. Composition ranged from X=40 to X=55 diameter of sintered body ranged from D=6.5 to D=12.5(mm) and diameter of electrode ranged from De=5.5 to De=11 (mm) In the composition of morphotropic phase boundary antiresonant frequency (fa) dcreased slowly whereas resonant frequency (fr) decreased rapidly on the ground of this Δf(fa-fr) and electromechanical coupling fractor Kp increased and Qm showed low value. On the contrary in toward the composition of tetragonal and rhombo-hedral fa increased slowly whereas fr increased rapidly on the ground of this Δf and Kp decreased and Qm increased abruptly. Substance of the above statements have no concern with size of sintered body and ele-ctrode. The other side as the size of electrode decreased Qm fr, fa and Δf increased. Cm and Co dominantly affect the resonant frequency and antiresonant frequency.