• Journal of the Korean Institute of Electrical and Electronic Material Engineers
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• v.18 no.3
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• pp.237-242
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• 2005

In this paper, in order to develop the low temperature sintering ceramics for multilayer piezoelectric transformer, PMN-PZT ceramics were manufactured with the variations of sintering times, and their microstructural, piezoelectric and dielectric properties were investigated. Li$_2$CO$_3$ and Bi$_2$O$_3$ were used as sintering aids and the specimens were sintered during 30, 60, 90, 120, 150, and 180 minutes, respectively. At the specimen sintered during 90 minute, mechanical quality factor(Qm), electro-mechanical coupling factor(kp) and dielectric constant were showed the optimum values of 2,356, 0.504 and 1,266, respectively.

• Proceedings of the KIEE Conference
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• 1989.07a
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• pp.349-352
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• 1989

Poling piezoelectric ceramic-polymer composites with 0-3connectivity is difficult because of the high dielectric constant of most of the ferroelectric filler materials, and the high resistivity of the polymer matrix. To aid in poling this type of composite, conductivity of the polymer phase can be controlled by adding small amount of a semiconductor phase such as germanium, carbon or silicon. In this study, flexible piezoelectric composites of $PbTiO_3$ powder and Eccogel polymer were developed using small amounts of a semiconducting phase. These composites were poled rapidly at low voltages, resulting in properties superior to composites prepared without a conductive phase. The effect of addition of various conductive phase with different volume percentage on the dielectric and piezoelectric properties of the composite are discussed here.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2001.11b
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• pp.434-437
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• 2001

In this study piezoelectric and dielectric properties of $Pb(Mn_{1/3}Nb_{2/3})O_{3}-Pb(Zr,Ti)O_{3}$ ceramics were investigated with $Pb(Ni_{1/3}Nb_{2/3})O_{3}$ substitution. As the $Pb(Ni_{1/3}Nb_{2/3})O_{3}$ substitution was increased, dielectric constant and electromechanical coupling factor (kp) were increased while mechanical quality factor decreased.

• Journal of the Korean Ceramic Society
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• v.25 no.1
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• pp.21-26
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• 1988

The piezoelectric properties and temperatureproperties of resonant frequency of the pseudoquaternary soild solution 0.075 Pb(Sb$\frac{1}{2}$Nb$\frac{1}{2}$)O3-0.025 Pb(Mn1/3Nb2/3)O3-xPbTiO3-(0.9-x) PbZrO3 were investigated. The composition range examined are 0.32 x 0.57. Specimens were prepared by the conventional mixed oxide technique, calcined at 850$^{\circ}C$ for 1 hour and sintered at 1270$^{\circ}C$ for 2 hours under PbO atmosphere. From the results of XRD, dielectric and piezoelectric properties, it is supposed that the MPB composition between tetragonal and rhombohedral ferroelectric perovskite exists in 0.42$^{\circ}C$ was considered at the nearby MPB.

• Proceedings of the KIEE Conference
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• 1997.07d
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• pp.1510-1512
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• 1997

Piezoelectric characteristics of lead zirconate(PZ)-lead titanate(PT)-lead manganese antimony(PMS) ceramics with the various changes of calcination temperature in PMS were prepared. The range of their sintering temperature was from $1100^{\circ}C$ to $1250^{\circ}C$. The electro-mechanical properties of PZ-PT-PMS ceramics such as piezoelectric constant, electro-mechanical coupling coefficient, and mechanical quality factor are measured as a function of the calcination temperature of PMS. As increasing the calcination temperature of PMS mechanical quality factor is increased.

• The Transactions of the Korean Institute of Electrical Engineers
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• v.41 no.1
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• pp.50-55
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• 1992

Piezoelectric Buzzer which has been generally used requires about 30kV/cm poling process and has the aging effects. In this study, 0.85 PZN - 0.10 BT - 0.05 PT system ceramics with additives of 0 - 2 wt% YS12TOS13T were fabricated and investigated on electromechanical coupling coefficient(kS1pT), electric field induced charge coefficient(dS131T), and sound level. As the results, in the 0.4 wt% YS12TOS13T added composition ceramics compared with the basic, kS1pT was increased from 0.355 to 0.39 and induced piezoelectric d constant increased from 204 to 220 x 10S0-12T (C/N) and sound level of electrostrictive Buzzer has the highest value of 71.5 dB under 8kV/cm bias electric field.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 1999.05a
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• pp.645-648
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• 1999

With the variation of the sintering temperature and the amounts of B$_2$O$_3$, Bi$_3$O$_3$ and V$_2$O$_{5}$ , the densification and the piezoelectric properties of the MnO$_2$-doped PMN-PZT were investigated. The additives decreased the sintering temperature of ceramics. In the case of 0.5wt% B$_2$O$_3$, the sintering density, the mechanical quality factor, the electromechanical coupling factor and the piezoelectric constant were 7.51 (g/㎤), 1397, 51.1% and 305 (X10$^{-12}$ C/N) respectivly at 105$0^{\circ}C$. And the addition of lwt% Bi$_2$O$_3$, they were 7.59 (g/㎤) ,833,49.8% and 308 (X10$^{-12}$ C/N) respectivly at 1000 $^{\circ}C$.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2001.11a
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• pp.434-437
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• 2001

In this study piezoelectric and dielectric properties of Pb(Mn$\sub$1/3/Nb$\sub$2/3/)O$_3$-Pb(Zr,Ti)O$_3$ ceramics were investigated with Pb(Ni$\sub$1/3/Nb$\sub$2/3/)O$_3$ substitution. As the Pb(Ni$\sub$1/3/Nb$\sub$2/3/)O$_3$) substitution was increased, dielectric constant and electromechanical coupling factor (kp) were increased while mechanical quality factor decreased.

• The Transactions of the Korean Institute of Electrical Engineers C
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• v.53 no.2
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• pp.116-122
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• 2004

A micromachined self-exited piezoelectric cantilever has been fabricated using PZT(52/48) thin film. For the application to biosensor using antigen-antibody interaction, electromechanical properties such as resonant frequency and quality factor of micromachined piezoelectric cantilever were important factors. Electromechanical properties and resonant behaviors of microfabricated cantilever were simulated by FEA (Finite Element Analysis) using Coventorware$^{TM}$2003. And these characterization of microcantilever were measured by using LDV(Laser Doppler Vibrometer) to compare with FEA data. We present the resonant frequency shift of micromachined piezoelectric cantilevers due to combination of mass loading and change of spring constant by gold deposition. Experimental mass sensitivities of microcantilever were characterized by Au deposition on the backside of microcantilever. Mass sensitivities with $100{\times}300$ ${\mu}{\textrm}{m}$ dimension cantilever from simulation and experimental were 5.56 Hz/ng and 16.8 Hz/ng respectively.y.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2000.11a
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• pp.238-241
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• 2000

In this paper, we manufactured Pb($Ni_{1/2}$ $W_{1/2}$)$O_3$-Pb($Mn_{1/3}$$Nb_{2/3}$)$O_3$-Pb($Zr_3$Ti)$O_3$ceramics with variation of milling time and investigated its dielectric and piezoelectric properties. Density was increased with the increase of milling time because the sinterability of specimens were improved with the decrease of particle size. The highest value of electromechanical coupling factor was 0.518 at milling time 5hour. The highest values of mechanical quality factor and dielectric constant were 1566, 1590 at milling time 4hour, respectively.