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졸-겔법으로 성장시킨 바나듐이 도핑된 ${Bi_4}{Ti_3}{O_{12}}$ 박막의 미세구조 및 전기적 특성
김종국,김상수,최은경,김진흥,송태권,김인성,Kim, Jong-Guk,Kim, Sang-Su,Choe, Eun-Gyeong,Kim, Jin-Heung,Song, Tae-Gwon,Kim, In-Seong 한국재료학회 2001 한국재료학회지 Vol.11 No.11
$Bi_{3.99}Ti_{2.97}V_{0.03}O_{12}$ (BTV) thin films with 3 mol% vanadium doping were Prepared on $Pt/Ti/SiO_2/Si$ substrate by sol-gel method. X-ray diffraction analysis indicated that single-phase layered perovskite were obtained and preferred orientation was not observed. Under the annealing temperature at $600^{\circ}C$, the surface morphology of the BTV thin films had fine-rounded particles and then changed plate-like at $650^{\circ}C$ and $700^{\circ}C$. The remanent polarization $(2P_r)$ and coercive field $(2E_c)$ of $700^{\circ}C$ annealed BTV thin film were 25 $\mu$C/cm$^2$ and 116 kV/cm, respectively. In addition, BTV thin film showed little polarization fatigue during $10_9$ switching cycles. These improved ferroelectric properties were attributed to the increased rattling space and reduced oxygen vacancies by substitution $Ti^{4+}$ ion (68 pm) with smaller $V^{5+}$ ion (59 pm). The dielectric constant and loss were measured 130 and 0.03 at 10 kHz, respectively.
자발성 종격동기흉과 심낭기종을 동반한 특발성 폐섬유증의 급성 악화
윤세영 ( Yun Se Yeong ),김용호 ( Kim Yong Ho ),최은경 ( Choe Eun Gyeong ),홍석균 ( Hong Seog Gyun ),지영구 ( Ji Yeong Gu ),이계영 ( Lee Gye Yeong ),최영희 ( Choe Yeong Hui ),명나혜 ( Myeong Na Hye ),박재석 ( Park Jae Seog ) 대한결핵 및 호흡기학회 2001 Tuberculosis and Respiratory Diseases Vol.50 No.6