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Dy<sub>2</sub>O<sub>3</sub>를 첨가한 (Ba,Sr,Ca)TiO<sub>3</sub> 후막의 구조 및 전기적 특성 연구
노현지,박상만,윤상은,이성갑,Noh, Hyun-Ji,Park, Sang-Man,Yun, Sang-Eun,Lee, Sung-Gap 한국전기전자재료학회 2007 전기전자재료학회논문지 Vol.20 No.8
In this study, we investigated the effects of structural and electrical properties of $(Ba_{0.6},\;Sr_{0.3},\;Ca_{0.1})TiO_3$ thick films with variation $Dy_2O_3$ contents. $(Ba_{0.6},\;Sr_{0.3},\;Ca_{0.1})TiO_3$ powders, prepared by the sol-gel method, were mixed organic vehicle. The BSCT thick films doped with 0.1, 0.3, 0.5, 0.7 mol% $Dy_2O_3$ were fabricated by the screen-printing techniques on the alumina substrates and the structural and dielectric properties were investigated with variation of $Dy_2O_3$ doping contents. All BSCT thick films were sintered at $1420^{\circ}C$, for 2hr. In the TG-DTA analysis, the formation of the polycrystalline perovskite phase was observed at around $670 ^{\circ}C$. In the XRD analysis, all BSCT thick films showed the cubic perovskite structure. The average thickness of BSCT thick films was approximately $65{\mu}m$. The Curie temperature decreased with increasing $Dy_2O_3$ amount. The relative dielectric constant and dielectric loss of BSCT thick films doped with $Dy_2O_3$ 0.1 mol% were 6267 and 2.6 %, respectively.
Dy₂O₃가 첨가된 BaTiO₃계 강유전체 후막의 유전특성
盧炫志(Hyun-Ji Noh),尹相恩(Sang-Eun Yun),朴尙萬(Sang-Man Park),李成甲(Sung-Gap Lee),安秉立(Byeong-Lib Ahn) 대한전기학회 2007 전기학회논문지 Vol.56 No.9
(Ba,Sr,Ca)TiO₃ powders, which were prepared by sol-gel method using a solution of Ba-, Sr- and Ca-acetate and Ti isc-propoxide, were mixed with organic vehicle and the BSCT thick films were fabricated by the screen-printing techniques on high purity alumina substrates. The structural and dielectirc properties were investigated for various Dy₂O₃ doping contents. As a result of thermal analysis, the exothermic peak was observed at around 670℃ due to the formation of the polycrystalline perovskite phase. All BSCT thick films, sintered at 1420℃ for 2h, showed the typical XRD patterns of perovskite poly crystalline structure and no pyrochlore phase was observed. The average grain size of the specimens decreased with increasing amount of Dy₂O₃. The average grain size and thickness of the BSCT specimens doped with 0.1 mol% Dy₂O₃ were approximately 1.9㎛ and 70㎛, respectively. The relative dielectric constant decreased and dielectric loss increased with increasing amount of Dy₂O₃, the values of the BSCT thick films doped with 0.1 mol% DYZ03 were 3697 and 0.4% at 1 ㎑, respectively. The leakage current densities in all BSCT thick films were less than 10?? A/㎠ at the applied electric field range of 0-20 ㎸/㎝.
(Ba, Sr, Ca)TiO₃ 후막의 전기적 특성에 미치는 Dy₂O₃첨가의 영향
노현지(Hyun-Ji Noh),이성갑(Sung-Gap Lee),이영희(Young-Hie Lee),남성필(Sung-Pill Nam) 대한전기학회 2008 대한전기학회 학술대회 논문집 Vol.2008 No.10
페로브스카이트 구조의 (Ba, Sr, Ca)TiO₃ 분말에 Dy₂O₃ 불순물을 첨가하여 첨가량에 따른 영향을 연구하였다. 시편의 제작은 Screen printing을 이용하여 후막으로 제작하였으며, 구조적인 특성과 전기적인 특성을 관찰하였다. XRD 회절 분석을 통하여 Dy₂O₃가 첨가된 모든 시편에서 이차상이 없는 전형적인 페로브스카이트 구조를 나타내었다. 시편의 미세구조를 관찰한 결과 gram size는 Dy₂O₃ 첨가량이 증가 할수록 감소하였으며, 기공은 증가하는 것을 알 수 있었다. 후막의 두께는 Dy₂O₃ 첨가량에 영향을 받지 않았으며 평균 두께는 69㎛이었다. 큐리 온도는 Dy₂O₃ 첨가량에 따라 감소하였으며, 유전 손실은 상온 이상에서 1%이하로 크게 감소하였다.
The fabrication and analysis of BSCT thick films for uncooled infrared detectors
노현지(Hyun-Ji Noh),이성갑(Sung-Gap Lee),배선기(Seon-Gi Bae) 대한전기학회 2008 대한전기학회 학술대회 논문집 Vol.2008 No.10
(Ba<SUB>0.57</SUB>Sr<SUB>0.33</SUB>Ca<SUB>0.10</SUB>)TiO₃ (BSCT) thick films doped with 0.1 mol% MnCO₃ and Yb₂O₃ (0.1~0.7 mol%) were fabricated by the screen printing method on the alumina substrate. And the structural and electrical properties as a function of Yb₂O₃ amount were investigated. The lattice constants of the BSCT thick film doped with 0.1 mol% is 0.3955 ㎚. The specimen doped with 0.7 mol% Yb₂O₃ showed dense and uniform grains with diameters of about 6.3 ㎜. The thickness of all BSCT thick films was approximately 60 ㎜. The Curie temperature of the BSCT specimen doped with 0.1 mol% Yb₂O₃ was 18℃, and the dielectric constantand dielectric loss at this temperature was 4637 and 4.2%, respectively. The BSCT specimen doped with 0.1 mol% Yb₂O₃ showed the maximum value of 349X10? C/㎠K at Curie temperature. The figure of merit F<SUB>D</SUB> for specific detectivity of the specimens doped with 0.1 mol% Yb₂O₃ showed the highest value of 10.9×10? C㎝/J.
다층 PZT(20/80)후막과 PZT(80/20)박막이 소결온도에 따른 전기적 특성 (pp.2209-2210)
노현지(Hyun-ji Noh),이성갑(Sung-gap Lee),박상만(Sang-man Park),배선기(Seon-gi Bae) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.7
In this paper, PZT(20/80) thick films were fabricated by the screen-printing method. And the PZT(80/20) coating solution was synthesized by the sol-gel method. PZT(20/80) thick films were screen-printed on the alumina substrates. PZT(80/20) thin film was spin-coated on the PZT(20/80) thick films to obtain densification. And the structural and electrical properties of PZT thick films were investigated with variation of sintering temperature. The PZT specimen sintered at 650℃ showed good relative dielectric constant of 219 and dielectric loss of 2.45%. Also the remanent polarization and the coercive field were 16.48 μC/㎠ and 35.48㎸/㎝, respectively.
PZT(5/95)PZT(95/5) 이종층 박막의 코팅횟수에 따른 구조적 특성
노현지(Hyun-Ji Noh),이성갑(Sung-Gap Lee),남성필(Sung-Pill Nam),배선기(Sun-Gi Bae) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.11
The tetragonal PZT(5/95) and rhombohedral PZT(95/5) materials have ferroelectric and antiferroelectric characteristics, respectively. In this study, ferroelectric PZT(5/95)/antiferroelectric PZT(95/5) heterolayered thin films were fabricated by the sol-gel method, which were spin-coated onto the Pt/Ti/SiO₂/Si substrate alternately using PZT(5/95) and PZT(95/5) metal alkoxide solutions. We investigated the role of the lower PZT film in crystallization of the upper PZT film and the structural changes of the PZT film interfaces in heterolayered thin films. And structural and electrical properties were also investigated with variation of concentration of PZT coating solutions 0.1~0.7M. The PZT heterolayered thin films showed the typical XRD patterns of perovskite polycrystalline structure, and pyrochlore phase or rosette structures were not observed.
다층 PZT(20/80)후막과 PZT(80/20)박막의 소결온도에 따른 전기적 특성 (pp.1703-1704)
노현지(Hyun-ji Noh),이성갑(Hyun-ji Noh),박상만(Sang-man Park),배선기(Seon-gi Bae) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.7
In this paper, PZT(20/80) thick films were fabricated by the screen-printing method. And the PZT(80/20) coating solution was synthesized by the sol-gel method. PZT(20/80) thick films were screen-printed on the alumina substrates. PZT(80/20) thin film was spin-coated on the PZT(20/80) thick films to obtain densification. And the structural and electrical properties of PZT thick films were investigated with variation of sintering temperature. The PZT specimen sintered at 650t showed good relative dielectric constant of 219 and dielectric loss of 2.45%. Also the remanent polarization and the coercive field were 16.48 μC/㎠ and 35.48㎸/㎝, respectively.
PZT 후막의 미세 구조적 특성에 조성과 전구체 용액의 코팅이 미치는 영향
박상만,노현지,이성갑,Park, Sang-Man,Noh, Hyun-Ji,Lee, Sung-Gap 한국전기전자재료학회 2006 전기전자재료학회논문지 Vol.19 No.11
The influence of the number of solution coatings on the densification of the PZT thick films was studied. PZT powder and PZT precursor solution was prepared by a sol-gel method and PZT thick films were fabricated by the screen-printing method on the alumina substrates. The powder and solution of composition were (A) PZT(80/20)/PZT(20/80), (B) PZT(70/30)/PZT(30/70) and (C) PZT(60/40)/PZT(40/60), (D) PZT(52/48)/PT. The coating and drying procedure was repeated 4 times. And then the PZT precursor solution was spin-coated on the PZT thick films. A concentration of a coating solution was 0.5 moth and the number of coating was repeated from 0 to 6. The porosity of the thick films was decreased with increasing the number of coatings and the PZT thick films with 6-times coated showed the dense microstructure and thickness of about $60{\mu}m$. A grain size was increased with increasing the coating number. All PZT thick films showed the typical XRD patterns of a typical perovskite polycrystalline structure. The relative dielectric constant of PZT thick films was improved 30-100% as the number of coatings.