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채문순,이규탁,고중혁,Chae, Moon-Soon,Lee, Ku-Tak,Koh, Jung-Hyuk 한국전기전자재료학회 2011 전기전자재료학회논문지 Vol.24 No.10
1 mol% $Li_2O$ excess $0.9(Na_{0.52}K_{0.48})NbO_3-0.1LiTaO_3$ lead-free piezoelectric multilayer ceramic actuators were investigated to determine their aging properties. To reduce the thermal aging behavior, we applied a rectified unipolar electric field of 5 kV/mm to the specimen to accelerate the electric aging behavior. By employing a rectified unipolar electric field for the piezoelectric actuators, we could remove undesirable heating from the relaxation current in the motion of the ferroelectric domain. To accelerate the aging test, the applied electric fields had a frequency of 900 Hz. To have enough time for charging and discharging, we employed an accurate time constant to design the equivalent circuit model for the aging tester. To extract exact aging behavior, we measured the pseudo-piezoelectric coefficient before and after the aging process. We also measured the electro-mechanical coupling coefficient, the frequency-dependent dielectric permittivity, and the impedance to compare with fresh and aged specimen.
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Ag<sub>2</sub>O 첨가량에 따른 0.95(Na,K)NbO<sub>3</sub>-0.05LiNbO<sub>3</sub> 세라믹스의 압전 특성
채문순,신동진,고중혁,Chae, Moon-Soon,Shin, Dong-Jin,Koh, Jung-Hyuk 한국전기전자재료학회 2012 전기전자재료학회논문지 Vol.25 No.6
As lead-free piezoelectric materials, $Ag_2O$ doped $0.95(K_{0.5}Na_{0.5})NbO_3-0.05LiNbO_3+x$ mol% (where x = 0, 0.5, 1, 1.5, 2, 2.5 and 3, respectively) ceramics were fabricated by a conventional sintering process. The doping effects on the microstructure and electrical properties of the $0.95(K_{0.5}Na_{0.5})NbO_3-0.05LiNbO_3$ ceramics were systematically investigated. When the 3 mol % $Ag_2O$ doped $0.95(K_{0.5}Na_{0.5})NbO_3-0.05LiNbO_3$ samples were sintered at $1,080^{\circ}C$ for 5 hrs in air, these ceramics showed excellent values of density=4.20 $g/cm^3$, piezoelectric constant ($d_{33}$)=174 pC/N and phase transition temperature$(T_c)=421.6^{\circ}C$, respectively.
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Effects of Ag2O Dopants on the Piezoelectric Properties of 0.94(K0.5Na0.5)NbO3-0.06LiNbO3 Ceramics
채문순,고중혁 한국물리학회 2012 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.60 No.2
Lead-free piezoelectric Ag2O-doped 0.94(K0.5Na0.5)NbO3-0.06LiNbO3 ceramics were investigated for their piezoelectric properties through use of a conventional sintering process. The effects of Ag dopants on the microstructure and the electrical properties of 0.94(K0.5Na0.5)NbO3-0.06LiNbO3 ceramics were systematically investigated. Ag dopants were added to 0.94(K0.5Na0.5)NbO3-0.06Li NbO3 ceramics at 1, 2, 3, 4, 5, 6, 7, and 8 mol%. X-ray diffraction analysis was performed to determine the structural properties and the lattice parameters. Piezoelectric constants and the temperature-dependent dielectric permittivity were measured. When the 7 mol% Ag2O-doped 0.94(K0.5Na0.5)NbO3-0.06LiNbO3 specimens were sintered at 1080 °C for 5 h, it showed the highest values of the density (4.32 g/cm3), the piezoelectric constant(d33) (274 pC/N) and the phase transition temperature Tc (465 °C).
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Ag2O 첨가량에 따른 0.95(Na,K)NbO3-0.05LiNbO3 세라믹스의 압전 특성
채문순,고중혁,신동진 한국전기전자재료학회 2012 전기전자재료학회논문지 Vol.25 No.6
압전 세라믹스 소재로 이용되는 PZT는 납(Pb)을 포함하여 인체와 환경에 유해하다. 최근 친환경적인 전자재료의 개발에 대해 관심이 고조되고 있으며, 대체 소재인 비납계 압전체가 각광을 받고 있다. 이들 중 NKN 계열의 무연 압전체는 높은 압전 특성과 높은 유전특성 가지고 있어서 많은 연구가 진행 중이다. 본 연구에서는 일반적인 산화물 혼합법으로 유전 및 압전 특성을 높이고자 무연 (Na,K)NbO3계 세라믹스를 제조하고 이 물질에 Ag2O를 첨가하여 Ag 함량 변화에 따른 시편의 구조적 특성 변화와 물질의 압전, 유전 특성 변화를 관찰하였다. As lead-free piezoelectric materials, Ag2O doped 0.95(K0.5Na0.5)NbO3-0.05LiNbO3+ x mol% (where x = 0, 0.5, 1, 1.5, 2, 2.5 and 3, respectively) ceramics were fabricated by a conventional sintering process. The doping effects on the microstructure and electrical properties of the 0.95(K0.5Na0.5)NbO3-0.05LiNbO3ceramics were systematically investigated. When the 3 mol % Ag2O doped 0.95(K0.5Na0.5)NbO3-0.05LiNbO3samples were sintered at 1,080℃ for 5 hrs in air, these ceramics showed excellent values of density=4.20g/cm3, piezoelectric constant (d33)=174 pC/N and phase transition temperature(Tc)=421.6℃, respectively.
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The Effect of Polymer Fill Ratio in Pillar Structure for Piezoelectric Energy Harvester
이경수,신동진,채문순,구상모,하재근,고중혁,조경호,서창의,정순종 대한금속·재료학회 2013 ELECTRONIC MATERIALS LETTERS Vol.9 No.4
One method of energy harvesting is to use piezoelectric devices, which are able to interchange electrical energy and mechanical strain or vibration. This study is to experimentally investigate the behavior of a piezoelectric energy harvester that was constructed with an array of pillar structures made of 0.2(PbMg1/3Nb2/3O3)-0.8(PbZr0.475Ti0.525O3) with polymer fill. Additionally, the aim of this study is to optimize the fill ratio of the composite piezoelectric ceramics and polymer structure. 0.2(PbMg1/3Nb2/3O3)-0.8(PbZr0.475Ti0.525O3) ceramics were employed as piezoelectric ceramic pillars, prepared in a rectangular shape. These piezoelectric ceramic pillars were sintered separately and attached to a bottom metallic electrode with poled states. The optimum ratio of ceramic pillar and elastic polymer ratio will be discussed. Piezoelectric properties will be discussed including the piezoelectric constant, piezoelectric voltage constants, and electromechanical coupling coefficient. We will present how the harvested energy depends on the lead resistor.
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Glass Substrate와 PET Film위에 Screen Printing된 ZnO Thick Film의 구조적 전기적 특성
이규탁,전민철,채문순,이경주,문병무,고중혁,Lee, Ku-Tak,Jeon, Min-Cheol,Chae, Moon-Soon,Lee, Kyung-Ju,Moon, Byung-Moo,Koh, Jung-Hyuk 한국전기전자재료학회 2011 전기전자재료학회논문지 Vol.24 No.5
As a II-IV compound semiconductor, ZnO has a wide band gap of 3.37 eV with transparent properties. Due to this transparent properties, ZnO materials can be also employed as the transparent conducting electrode materials. Recently, rapid progress has been made in the field of DSSC (dye sensitized solar cell)area. Therefore, strong demands have been required for the transparent electrodes with low temperature processing and cheap cost. In this paper, we will prepare ZnO thick films on the PET substrates for the electrode applications. We will investigate the structural and microstructure properties through the XRD, and SEM analysis, respectively. Also, we will study the electrical of specimens to apply the conducting electrode.
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