• 한국세라믹학회지
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• 제40권10호
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• pp.925-930
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• 2003

The dielectric polarizability-related factors contributing to the $\tau$$_{\varepsilon}$ have been analysed in terms of dielectric permittivity $\varepsilon$, Tolerance Factor (TF), and octahedron tilt angles in (1-x)CaTi $O_3$-x[A(B', B″) $O_3$] (A=Ca, La, Li, B'=Al, Fe, Mg, B″=Nb, Ta) and (S $r_{0.2}$C $a_{0.8}$)( $Ti_{1-x}$ Z $r_{x}$) $O_3$. All the compounds have the orthorhombic Pbnm structure except the end members A(B', B″) $O_3$ and the solid solutions of x$\geq$0.8. The additional dipole field effect is suggested as a dominant factor contributing to $\tau$$_{\varepsilon}$ in CaTi $O_3$-based ceramics having relatively large $\varepsilon$, which has not been generally considered in the previous reports dealing with the $\tau$$_{\varepsilon}$. This study has been focussed on delineating the dipole field effect on the $\tau$$_{\varepsilon}$ in comparison to the octahedron tilt effect in CaTi $O_3$-based ceramics.cs..cs.

• 전기의세계
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• 제30권6호
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• pp.357-365
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• 1981

When electronegative gas SF$_{6}$ is dissolved and charged with insulating oil, the effect caused in the process by electronegative characteristic is studied and also the pressure effect caused by electronegative SF$_{6}$ acting on the liquid-level is examined respectively. When inert gas Ar is used to find a pressure effect acting on the liquid-level, its effect on dielectric strength is considered in the experiment. With three kinds of impulse voltage different in the duration of wave front and wave tail, a brief experiment if carried out ot see the effects on the dielectric breakdown characteristic as the wave is changing; either if I$_{2}$ and SF$_{6}$ are added to the insulating oil, or if the oil pressure is increased by Ar the dielectric strength becomes great and the longer the duration of wave front is, the greater the increase of the breakdown voltage, because I$_{2}$ added by a small quantity brings about some hirderance in the formation of gas phase. Likewise, the greater the changed pressure is, the greater the incerase of the breakdown voltage. When SF$_{6}$ is charged, the electronegative characteristic is prevailing at the time of low balanced pressure, and the pressure effect at the time of high balanced pressure.ressure.

• 한국진공학회지
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• 제18권6호
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• pp.453-458
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• 2009

SiOC 박막을 BTMSM과 산소의 혼합가스를 사용하여 CVD 방법으로 증착하였다. 박막의 특성은 가스 유량비에 따라서 변하였다. 유전상수는 MIS 구조를 이용하여 C-V 측정법에 의하여 얻었다. 결합의 말단을 구성하는 Si-$CH_3$ 결합 사이의 공간효과에 의해서 기공이 만들어지며, 기공의 형성에 의해서 박막의 두께가 증가하였다. 그러나 분극의 감소에 의해서 만들어지는 SiOC 박막은 두께가 감소하면서 유전상수도 감소되었다. 열처리 후 유전상수는 수산기의 기화에 의해서 감소되었다. 박막의 두께는 분극의 감소에 의한 유전상수의 감소와 연관이 있었다. 굴절률은 박막의 두께에 반비례하는 경향성이 있으며, 박막의 두께와 굴절률의 경향성은 열처리 후에도 변하지 않았다.

• 마이크로전자및패키징학회지
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• 제21권4호
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• pp.111-115
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• 2014

다마신 구리 배선에서의 동적인 전기장에 따른 절연체 파괴거동을 연구하였다. DC, 단극성, 및 이극성 펄스 조건 중에서 절연체의 수명은 이극성 펄스 조건에서 가장 길었다. DC 및 단극성 펄스 조건에서는 절연체에 가해지는 전기장의 방향이 바뀌지 않지만 이극성 펄스 조건에서는 전기장의 방향이 반복적으로 180도 바뀌기 때문에, 이극성 펄스 조건에서는 절연체의 구리오염이 억제되고, 이로 인해서 절연체 수명이 이극성 펄스 조건에서 가장 긴 것으로 판단된다. 단극성 펄스 조건에서 펄스 주파수가 커질수록 DC 조건보다 절연체의 수명이 증가하였다. 이는 절연체 수명에 구리오염 뿐만 아니라 내재적인 절연파괴현상이 상당한 영향을 미치며, 절연체 분자결합파괴가 일어날 확률은 펄스 폭이 좁아질수록 감소한다고 판단된다.

• 한국전자파학회논문지
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• 제20권1호
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• pp.60-66
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• 2009

본 논문은 유전체로 막힌 개구를 갖는 함체의 차폐 효과(SE)를 계산하는 해석적 방법을 제안한다. 제안된 방법은 기존의 방법으로 해석할 수 없는 유전체로 막힌 개구를 갖는 함체의 SE 해석이 가능하다. 제안된 방법의 타당성을 검증하기 위해 기존에 제시된 방법과 상용 프로그램의 SE 해석 결과를 비교 검증하였다. 제안된 방법을 이용하여 덮개 유전체의 유전율과 두께 변화, 함체 내 관측점 위치 변화, 개구의 폭과 높이 변화에 대한 SE 변화를 계산하였다.

• 한국안전학회지
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• 제6권3호
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• pp.12-20
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• 1991

The dielectric properties that effect to electric safety for unsaturated Pelvester resin were studied over the temperature range of 30-40［$^{\circ}C$］ and the frequency range of 110~3$\times$10$^{6}$ ［Hz］. According to the results of the study, it has been observed that two kinds of dielectric losses in electric safety were existed by the molecular movement of C-H and OH group. When the ,adio of hardener was 1.5［%］, the characteristics of specimens were excellent in view of the electrical materical. In the range of measuring frequency the dielectric constants and the dielectric losses were 3.5~5.5 and 10$^2$~10$^3$ respectly. The activation energy of loss spectrum in aspect of electric safety and the entropy appeared at the 30［$^{\circ}C$］ were 33.4［Kacl/mole］ and 54.9［cal/mole.deg］ respectly.

• 마이크로전자및패키징학회지
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• 제12권1호
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• pp.17-20
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• 2005

In this paper, we presented the quasi-static characteristics of novel microstrip lines with anisotropic grooved dielectric in finite metal. A quasi-static mode-matching method has been used to analyze this new structure and the simulation results are validated through comparison with other available results. The results in this paper show that it is possible to control the propagation characteristics of microstrip lines with the use of anisotropic grooved dielectric in finite metal. Also anisotropic grooved dielectric in microstrip line can be newly added to the design parameters of high performance three dimensional monolithic microwave circuits and other microwave applications.

• 전자공학회논문지D
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• 제34D권2호
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• pp.21-26
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• 1997

The dielectric effects on the parasitics of bondwires buried in slightly-lossy dielectric materials hav been investigated over a wide frequency range using the method of moments with incorporation of ohmic and dielectric losses. The FR-4 composite is widely used as a basis material for PCB and plastic packages, because of it sinherent electricl and chemical stbility and low cost. The cole-cole model, which is representative complex permittivity model of epoxy polymers, has been applied to consider the dielectric effects in the MoM calculation. The prasitic impedance of a grounded bondwire in FR-4 composite is greatly increased due to the dielectric loading effect enhanced by the radiation at high frequencies. These calculation results will be helpful for designing and packaging of high-frequency low-cost IC's.

• Journal of Information Display
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• 제11권3호
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• pp.95-99
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• 2010

A series of new dielectric polymers with phenyl, epoxy, and carboxylicacid functional groups was prepared via free-radical polymerization. The effect of such dielectric polymers with various functional groups on the performance of OTFT was investigated. The nonpolar groups of terpolymer made the surface of the dielectric layer more hydrophobic and improved the crystal growth of pentacene on the gate insulator, resulting in higher mobility. By controlling the functional group, the electric characteristics of OTFT performance was varied, with $0.00017-0.15\;cm^2/V{\cdot}s$ mobility.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2002년도 추계학술대회 논문집 Vol.15
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• pp.155-158
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• 2002

Eu-doped lead zirconium titanate $Pb_{1.1}(Zr_{0.3}Ti_{0.7})O_{3}$ thin films on the Pt/Ti/$SiO_2$/Si substrates prepared by a metalorganic decomposition (MOD) method. The effect on the structural and electrical properties of the films measured according to Eu content. Eu-doping altered significantly the dielectric and ferroelectric properties. The remanent polarization and coercive field decreased with increasing the concentration of Eu content. The dielectric constant and dielectric loss of the film decreased with increasing Eu contents. The 3 mol% of Eu-doped PZT thin film showed large remanent polarization and the fatigue characteristic of the film did not change up to $10^9$ switching cycles.