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류주현,이상호,백동수,Yoo Ju-Hyun,Lee Sang-Ho,Paik Dong-Soo 한국전기전자재료학회 2006 전기전자재료학회논문지 Vol.19 No.1
In this study, in order to develop the multilayer piezoelectric actuator and ultrasonic resonator, PMN-PNN-PZT ceramics were fabricated by sintering with $Li_2CO_3-Na_2CO_3$ as sintering aids at $950^{\circ}C$ and their piezoelectric and dielectric characteristics were investigated as a function of PNN substitution. With increasing PNN substitution, dielectric constant(${\epsilon}_r$), electromechanical coupling factor(kp), and piezoelectric d constant($d_{33}$) were increased to $12 mol\%$ PNN substitution and then showed a tendency to decrease rapidly With increasing PNN substitution, crystal structure changed from tetragonal to rhombohedral at $12 mol\%$ PNN substitution and then secondary phase was appeared and its intensity was increased. At the $12 mol\%$ PNN substituted PMN-PZT composition ceramic sintered at $950^{\circ}C$, density, kp, $d_{33}$ and Qm showed the optimum value of $7.79 g/cm^3$, 0.599, 419 pC/N, and 894, respectively for multilayer piezoelectric actuator application.
저온소결 PMN-PNN-PZT 세라믹스를 이용한 고출력 강압용 적층 압전변압기의 전기적 특성
류주현,김국진,백동수,윤현상,Yoo, Ju-Hyun,Kim, Kook-Jin,Paik, Dong-Soo,Yoon, Hyun-Sang 한국전기전자재료학회 2007 전기전자재료학회논문지 Vol.20 No.4
In this study, multilayer piezoelectric transformer was manufactured using the PMN-PNN-PZT ceramic and then the electrical characteristics were investigated according to the variations of frequency and load resistance. The voltage step-up ratio of multilayer piezoelectric transformer showed the maximum value at the vicinity of 75 kHz and increased according to the increase of load resistance. When the output impedance coincided with the load resistance, the multilayer piezoelectric transformer showed the temperature rise of less than $20^{\circ}C$ at the output power of 20 W. As the results, the multilayer piezoelectric transformer manufactured at low co-firing temperature of $940^{\circ}C$ using PMN-PNN-PZT ceramics could be stably driven as the step-down transformers.
PMN-PZN-PZT 세라믹스를 이용한 적층형 압전변압기의 전기적 특성
이창배,류주현,백동수,강진규,조봉희,이성일,Lee, Chang-Bae,Yoo, Ju-Hyun,Paik, Dong-Soo,Kang, Jin-Kyu,Cho, Hong-Hee,Lee, Sung-Ill 한국전기전자재료학회 2006 전기전자재료학회논문지 Vol.19 No.7
Dielectric and piezoelectric properties of PMN-PZT ceramics with a high mechanical quality factor$(Q_m)$ and a low temperature sintering temperature were investigated as a function of PZN substitution in order to develop multilayer piezoelectric transformer for AC-DC converter. Multilayer piezoelectric transformers were subsequently manufactured using the PMN-PZN-PZT ceramic offering the optimal behavior and then the electrical performance were invetigated. At the sintering temperature of $940^{\circ}C$, density, electromechanical coupling factor$(k_p)$, mechanical qualify factor$(Q_m)$ and dielectric constant$(\varepsilon_r)$ of 8 mol% PZN substituted specimen were $7.73g/cm^3$, 0.524, 1573 and 1455, respectively. The PZN substitution caused a increase in the dielectric constant and the electromechnical coupling factor. The voltage step-up ratio of multilayer piezoelectric transformer showed the maximum value at near the resonant frequency of 76.55 kHz and increased according to the increase of load resistance. The multilayer piezoelectric transformer with the output impedance coincided with the load resistance showed the temperature increase of less than $20^{\circ}C$ at the output power of 10 W. Based on the results, the manufactured multilayer transformer using the low temperature sintered PMN-PZN-PZT ceramics can be stably driven for both step-up and down transformers.
레이저 에블레이션법으로 제작된 PLZT 박막의 구조 및 전기적 특성에 관한 연구
장낙원,마석범,백동수,최형욱,박창엽,Jang, Nak-Won,Mah, Suk-Bum,Paik, Dong-Soo,Choi, Hyung-Wook,Park, Chang-Yub 한국전기전자재료학회 1998 전기전자재료학회논문지 Vol.11 No.10
PLZT thin films were fabricated with different Zr/Ti ratios by pulsed laser deposition. PLZT films deposited on Pt/Ti/SiO$_2$/Si substrate. This PLZT thin films of 5000$\AA$ thickness were crystallized at $600^{\circ}C$, $O_2$ pressure 200m Torr. 2/55/45 PLZT thin film showed a maximum dielectric constant value of $\varepsilon$\ulcorner=1550 and dielectric loss was 0.03 at 10kHz. At 2/70/30 PLZT thin film, coercive field and remnant polarization was respectively 19[kV/cm], 8[$\mu$C/$\textrm{cm}^2$]. Raman spectroscopy results showed that the bands of spectra became broader as the amount of Zr mol% increased and two crystal phase coexisted at 2/55/45 PLZT film. Raman spectroscopy was useful for crystal structure analysis of PLZT thin films.
저온소결 PMN-PZT 압전세라믹의 소성시간에 따른 미세구조 및 압전특성
류주현,이창배,이상호,백동수,정영호,임인호,Yoo, Ju-Hyun,Lee, Chang-Bae,Lee, Sang-Ho,Paik, Dong-Soo,Jeong, Yeong-Ho,Im, In-Ho 한국전기전자재료학회 2005 전기전자재료학회논문지 Vol.18 No.3
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.
정광현,유경진,류주현,조봉희,윤현상,백동수,Chung Kwang-Hyun,Yoo Kyung-Jin,Yoo Ju-Hyun,Cho Bong-Hee,Yoon Hyun-Sang,Paik Dong-Soo 한국전기전자재료학회 2006 전기전자재료학회논문지 Vol.19 No.3
In this paper, in order to develop low temperature sintering $PbTiO_3$-system piezoelectric ceramics for thickness-vibration-mode piezoelectric transformer, $Pb_{0.76}Ca_{0.24}[(Mn_{1/3}Sb_{2/3})_{0.04}Ti_{0.96}]O_3$ ceramics using $0.25\;wt\%\;CaCO_3$ and $0.2\;wt\%\;Li_{2}CO_3$ as sintering aids were manufactured according to the variation of poling field. The specimens could be sintered at $930\;^{\circ}C$. The piezoelectric properties were investigated according to the poling field. The maximum properties showed at the field of 6.5 kV/mm, which had kt of 0.49, Qmt of 1816, and $d_{33}$ of 81.4 pC/N.
류주현,이유형,김도형,이일하,권준식,백동수,Yoo, Ju-Hyun,Lee, Yu-Hyong,Kim, Do-Hyung,Lee, Il-Ha,Kwon, Jun-Sik,Paik, Dong-Soo 한국전기전자재료학회 2008 전기전자재료학회논문지 Vol.21 No.2
In this study, in order to develop low loss multilayer piezoelectric actuator, PZN-PZT ceramics were fabricated using $Li_2CO_3,\;Bi_2O_3$, CuO and ZnO as sintering aids, their structural, piezoelectric and dielectric characteristics were investigated according to the amount of ZnO addition, At the sintering temperature of $870^{\circ}C$, the density, electromechanical coupling factor(kp), mechanical quality factor(Qm), dielectric constant(${\epsilon}_r$) and piezoelectric constant($d_{33}$) of 0.4 wt% ZnO added specimen (sintered at $870^{\circ}C$) showed the optimum value of $7.812g/cm^3$, 0.535, 916, 1399, 335 pC/N respectively. Taking into consideration above piezoelectric properties of the specimen sintered at low temperature, it was concluded that PZN-PZT ceramics using 0.4 wt% ZnO as additive showed the optimum characteristics as the composition ceramics for low loss multilayer piezoelectric actuator application.