• 한국분말야금학회:학술대회논문집
• /
• 한국분말야금학회 2006년도 Extended Abstracts of 2006 POWDER METALLURGY World Congress Part2
• /
• pp.1165-1166
• /
• 2006

An experiment was carried out to investigate the effect of Ba Stearate as a reducing agent on the magnetic and physical properties of anisotropic $BaFe_2-W$ type ferrite magnets. It was found that the magnetic properties of $BaO{\cdot}8.5Fe_2O_3$ were improved by adding 0.3 wt% of Ba Stearate, 0.5 wt% of $SiO_2$, and 0.5 wt% of CaO together. The optimum conditions for making magnets were as follows; semisintering condition: $1350^{\circ}C{\times}4.0$ h in nitrogen gas atmosphere, drying condition: $180^{\circ}C{\times}2.0$ h in air, sintering condition: $1160^{\circ}C{\times}1.5$ h in nitrogen gas atmosphere. Magnetic and physical properties of a typical sample were $J_m$ = 0.46 T, $J_r$ = 0.43 T, $H_{cJ}$ = 182.3 kA/m, $H_{cB}$ = 177.2 kA/m, $(BH)_{max}$ = 33.8 kJ/$m^3$, $T_C$ = $495^{\circ}C$ and $K_A$ = $2.65{\times}10^5\;J/m^3$ and $H_A$ = 1332 kA/m.

• 한국재료학회지
• /
• 제17권2호
• /
• pp.86-90
• /
• 2007

The organic-capped Ba-Ti-O nanolayers were coated uniformly on spherical Ni particles for multilayer ceramic capacitor (MLCC) applications via the formation of Ti-hydroxide nano-coating layers and their subsequent reaction with Ba-stearate at $180^{\circ}C$. The capping of organic shell on oxide coating layer changed the hydrophilic surface structure into hydrophobic one, which significantly improved the dispersion behavior in hydrophobic solvents such as terpineol and butanol. In addition, the uniform coating of Ba-Ti-O layer was advantageous to prevent Ni oxidation. This method provides a useful chemical route to fabricate organic-soluble Ba-Ti-O coated Ni particles for a highly integrated passive component.

• ETRI Journal
• /
• 제13권2호
• /
• pp.70-79
• /
• 1991

본 기초연구에서는 Langmuir-Blodgett technique의 기술현황을 정리하고 기본적인 증착조건에 관한 실험 및 증착된 막의 분석을 행하였다. Langmuir-Blodgett technique은 유기물을 nm정도까지 얇고 균일하게 입힐 수 있는 장점이 있기 때문에 tunneling barrier로서 전자소자에 응용 가능성이 높고, 분자의 배열을 조절할 수 있는 능력을 이용하여 2차 비선형계수를 이용한 광학소자에 높은 잠재력을 지니고 있다. 이 성질을 이용하기 위하여 Ba stearate 와 pentacosa diynoic acid막을 이용하여 기본적인 실험을 하고 그 막을 XRD와 ellipsometer 그리고 Nomarsky 현미경 등을 이용하여 분석하였다. 그 결과 LB막은 subphase의 pH와 온도의 영향을 받음을 알 수 있었으며, 위의 분석방법을 이용하여 양질의 막을 얻을 수 있는 조건을 제시하였다.