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BaO 과잉량에 따른 BaTiO<sub>3</sub>의 전기전도도
여홍구,국민호,김명호,송태권,배동식,박태곤,이순일,Yeo, Hong-Goo,Kuk, Min-Ho,Kim, Myong-Ho,Song, Tae-Kwon,Bae, Dong-Sik,Park, Tne-Gone,Lee, Soon-Il,Randall, Clive A. 한국세라믹학회 2005 한국세라믹학회지 Vol.42 No.5
In this study the electrical conductivity of excess BaO in $BaTiO_3$ was measured to investigate the relationship between defects and solubility in the temperature range of $900^{\circ}C$ to $1300^{\circ}C$ under various oxygen partial pressure. First of all, quenched $BaTiO_3$ powders of various Ba/Ti ratios were analysed by X-ray diffraction to confirm whether second phase is formed or not. As the results, we observed the solubility of BaO in the temperature range of $1200^{\circ}C$ to $1400^{\circ}C$, and it was also found that the conductivity minima move to lower $PO_2$ with increasing excess BaO within solubility limit.
비납계 Bi<sub>0.5</sub>Na<sub>0.5</sub>의 강유전 및 압전 특성에 미치는 Nb-doping 효과
여홍구,성연수,송태권,조종호,정순종,송재성,김명호,Yeo, Hong-Goo,Sung, Yeon-Soo,Song, Tae-Kwon,Cho, Jong-Ho,Jeong, Soon-Jong,Song, Jae-Sung,Kim, Myong-Ho 한국재료학회 2006 한국재료학회지 Vol.16 No.11
Nb was doped to Pb-free $(Bi_{0.5}Na_{0.5})TiO_3$ (BNT) by a solid state mixing process to form $(Bi_{0.5}Na_{0.5})Ti_{1-x}Nb_xO_3\;(x=0{\sim}0.05)$ (BNTNb) and its doping effects on ferroelectric and piezoelctric properties of BNT were investigated. The BNTNb solid solutions were formed up to x=0.01 with no apparent second phases while grain sizes decreased. As x increased, coercive field ($E_c$) and mechanical quality factor ($Q_m$) decreased but piezoelectric constant ($d_{33}$) increased, which indicates Nb acts as a donor for BNT.
呂鴻九 嶺南大學校 環境問題硏究所 1987 環境硏究 Vol.7 No.2
本 硏究는 種合學問的인 觀點에서 領域性을 定義하고, 領域性에 관한 기존의 일반적 이론과 調査硏究 및 住居環境設計의 適用例를 槪觀하고, 住居環境設計에 대한 領域性의 聯關關係를 究門함으로써 住居環境의 質的 改善을 위한 미래의 住居環境設計와 調査硏究가 指向해야할 方向을 提示하는 데 그 目的이 있다.