• 마이크로전자및패키징학회지
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• 제12권3호
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• pp.219-226
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• 2005

When a ferroelectric film has an inhomogeneous distribution of charged defects, a voltage shift in the polarization curve is induced by the internal field generated in the film. The direction and the magnitude of voltage shift in the P-V hysteresis curves obtained by the Sawyer-Tower method are different from those obtained by the virtual ground method. In this study, the asymmetric behavior in the P-V hysteresis curves of inhomogeneous ferroelectric films was investigated with a physical model and the polarization curves obtained by the Sawyer-Tower and the virtual ground methods are compared.

• 마이크로전자및패키징학회지
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• 제30권3호
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• pp.51-55
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• 2023

강유전체 분극 이력곡선의 측정은 강유전체의 구조와 유전특성을 전반적으로 평가하고 해석하는 중요한 수단이다. 강유전체 시편에 저항성분이 포함될 경우 자발분극의 측정 값에 오차가 포함된다. 분극을 측정하는 전기적 회로를 구성할 때, 시편에 포함된 저항성분에 대응하는 외부 저항을 적절히 활용함으로서 시편의 저항성 손실에 의한 오차를 배제하고 내부에 유도된 강유전체 분극의 크기를 정확하게 측정할 수 있었다. 이와 같은 정확한 분극 이력곡선의 평가를 통하여 강유전체 내부의 이온의 변위 및 유전특성을 보다 정확하게 평가할 수 있을 것으로 기대된다.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 1997년도 추계학술대회 논문집
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• pp.349-352
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• 1997

A Piezoelectric actuator yields hysteresis effect due to its composed ferroelectric. Hysteresis nonlinearity is neglected when a piezoelectric actuator moves with short stroke. However when it moves with long stroke and high frequency, the hysteresis nonlinearity can not be neglected. The hysteresis nonlinearity of piezoelectric actuator degrades the control performance in precision position control. In this paper, in order to improve the control performance of piezoelectric actuator, an inverse modeling scheme is proposed to compensate the hysteresis nonlinearity problem. And feedforward-feedforward-feedback controller is proposed to give a good tracking performance. The Feedforward controller is inverse hysteresis model, and PID control is sued as a feedback controller. To show the feasibility of the proposed controller and hysteresis modeling, some experiments have been carried out. It is concluded hat the proposed control scheme gives good tracking performance.

• E2M - 전기 전자와 첨단 소재
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• 제9권2호
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• pp.132-137
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• 1996

Pb(Zr$_{x}$Ti$_{1-x}$ )O$_{3}$ solutions prepared by sol-gel processing with different Zr/Ti ratio were coated on Pt/SiO$_{2}$/Si substrates using spin coating method. Coated films were annealed by rapid thermal annealing at 650.deg. C for 20sec to fabricate Pb(Zr, Ti)O$_{3}$ ferroelectric thin films. Electrical properties of the films such as dielectric constant and loss, ferroelectric hysteresis, fatigue, switching time, and leakage current were measured. Hysteresis of the films with different Zr/Ti ratio yield Pr ranging 10-21.mu.C/cm$^{2}$, E$_{c}$ ranging 37.5-137.5kV/cm. Hysteresis curve was changed from square-type to slim type according to increasing Zr contents. Switching time was faster than 180ns, and leakage current was about 20.mu.A/cm$^{2}$. The film underwent above 10$^{8}$ cycles of reversed polarization showed fatigue with increased coercive field and decreased remnant polarization.tion.

• 한국결정학회지
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• 제12권2호
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• pp.65-91
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• 2001

Sawyer-Tower 회로를 이용한 강유전 이력곡선의 측정에서 직류 누설성분에 의한 오차요인을 검토하고 그 해결책을 제안하였다. 강유전체 시편에 존재하는 직류 누설성분에 의한 잔류분극과 항전계는 항상 과대 평가될 수 있는 위험성이 있음을 알 수 있었으며 이러한 오차는 직류누설성분이 크고 측정시간이 길수록 심화되었다. Sawyer-Tower 회로를 이용한 강유전 이력곡선과 함께 보완적으로 활용할 수 있는 전류이력곡선을 새롭게 제안하였다.

• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2005년도 International Meeting on Information Displayvol.I
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• pp.334-337
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• 2005

We have found that the hysteretic behavior of a polymer stabilized ferroelectric liquid crystal system coincides with Blinov et. al's model qualitatively. The hysteresis inversion frequency could be promoted up to 7000 Hz by connecting external capacitor and resistor in serial. In addition, the influence of temperature and the amplitude of the applied field on hysteresis-free switching of the cell could be minimized.

• 대한전자공학회논문지SD
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• 제37권10호
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• pp.25-32
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• 2000

본 연구에서는 강유전체의 이력 특성을 정밀하게 계산하기 위한 모델을 제공하였다. 본 모델은 2중 전위우물에 근거한 반경험적 분극 천이 모델에 기초하고 있으며 프라이사흐의 이력 함수의 분포 모델의 물리적 특성과도 잘 일치되고 있음을 보였다. 본 모델은 강유전체 이력 특성의 천이 경사도와 임프린트 특성을 고려하고 있으며 인가 전압의 극성이 바뀌는 경우에 발생되는 부 이력 경로에 대해서도 정확하게 분극 전하의 변화를 표현하고 있음을 보였다. 본 모델의 예측 결과는 PZT와 SBT의 두 종류의 강유전체에 대해서 측정 결과와 잘 일치하고 있음을 보였다. 또한, 본 모델을 AHDL 코드로 구현하여 스펙트레 시뮬레이터를 통하여 회로 설계를 할 수 있는 환경을 제공하였다.

• 한국전기전자재료학회논문지
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• 제29권3호
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• pp.164-167
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• 2016

In this study, in order to develop relaxor ferroelectric ceramics for refrigeration device application with large electrocaloric effect, PLZT(8/65/35) composition was fabricated using conventional solid-state method. The Curi temperature of this composition PLZT ceramics was $230^{\circ}C$, and the P-E hysteresis loops of the PLZT ceramics as a fuction of temperature became slim by degrees with higher temperatures. The maximum value of ${\Delta}T$ of $0.243^{\circ}C$ in ambient temperature of $215^{\circ}C$ with 30 kV/cm was appeared. It is considered that PLZT ceramics possess the possibility of refrigeration device application.

• 센서학회지
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• 제32권4호
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• pp.238-245
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• 2023

0.75(Bi_1/2Na_1/2)TiO₃-0.25SrTiO₃ (BNT-25ST) ceramics with high densities were successfully prepared at a sintering temperature of 1,000℃ by adding a mixture of 1 mol% CuO and 0.5 mol% Na₂CO₃ or 0.5 mol% CuO and 0.25 mol% Na₂CO₃. Double polarization-electric field (P-E) hysteresis curves and sprout-shaped bipolar strain-electric field (S-E) hysteresis curves with small negative strains were observed in the pristine and CuO-added BNT-25ST ceramics whereas the Na₂CO₃-added sample showed similar P-E and S-E curves to a typical ferroelectric. The pristine BNT-25ST ceramics showed an extremely large strain and a large-signal piezoelectric strain constant (d₃₃^*): 0.287 % at 80 kV/cm and 850 pm/V at 20 kV/cm. Similar values, 0.248 % at 80 kV/cm and 655 pm/V at 20 kV/cm, were obtained in the CuO-added sample. However, the pristine and CuO-added samples showed large hysteresis in unipolar S-E curves at an electric field of less than 20 kV/cm. The Na₂CO₃-added sample showed smaller values of the strain and d₃₃^* but displayed a linear change and small hysteresis in the unipolar S-E curve. The co-added sample with CuO and Na₂CO₃ displayed intermediate P-E and S-E hysteresis curves.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1996년도 하계학술대회 논문집 C
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• pp.1472-1475
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• 1996

D-E hysteresis loops have been measured for the 65/35 mole % copolymer of vinylidene fluoride and trifIuoroethyIene over wide temperature range. The results were analyzed and discussed. The remanent polarization and the coercive field at room termperature were estimated to be 75 $mC/m^3$ and 55 MV/m respectively. D-E hysteresis loops were observed even below the glass transiation temperature$-20^{\circ}C$) and the remanent polarization and the coercive field were larger than larger, as the temperature lower. It seems that the remanent polarization and the coercive field depend on the amorphous region as well as crystalline region in this copolymer. And the ferroelectric-to-paraelectric phase transition was observed at $90^{\circ}C$ on heating and $80^{\circ}C$ on cooling. Double hysteresis loops were observed at the temperature($85^{\circ}C$) of paraelectric phase.