• 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.

• Proceedings of the KIEE Conference
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• 2005.07c
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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%] $B_2O_3$.

• Proceedings of the KIEE Conference
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• 2004.11a
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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 $1.32{\times}10^{-1}/kHz$.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2009.11a
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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.

• The Korea Swine Journal
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• v.24 no.11 s.279
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• pp.136-139
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• 2002

• The Korea Swine Journal
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• v.26 no.11 s.303
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• pp.138-141
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• 2004

• The Korea Swine Journal
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• v.24 no.3 s.271
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• pp.162-165
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• 2002

• The Korea Swine Journal
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• v.24 no.3 s.271
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• pp.171-174
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• 2002

• The Korea Swine Journal
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• v.26 no.10 s.302
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• pp.142-147
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• 2004

• The Korea Swine Journal
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• v.26 no.5 s.297
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• pp.102-105
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• 2004