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디스플레이 및 일시 기능 소자에 적용된 산화물 기반 박막 트랜지스터
남궁석,송민규,권장연 한국세라믹학회 2018 세라미스트 Vol.21 No.1
Oxide semiconductor has been spotlighted as a channel material of TFTs in AMLCD as an alternative to Si, due to high mobility ( > 5cm 2 /Vs). It is also one of the strong candidates for TFTs in AMOLED because of high bias stability at amorphous phase. Beyond the advantages mentioned above, oxide semiconductor has many strengths such as transparency, low fabrication temperature and relatively low fabrication cost. For those reasons, the application of oxide semiconductor is not limited to display but can be extended to new types of electronics, for example, transient electronics for human implantable devices. From this context, oxide materials that have been used as semiconductor and insulator at transient electronics are investigated respectively, and conductor and substrate candidates are also explained, since transient electronics require systematic consideration beyond individual oxide films.
Dy 화합물 혼합에 의한 (Nd, Dy)-Fe-B 소결자석의 자기특성 변화
남궁석,이민우,조인식,박영덕,임태환,이성래,장태석,NamKung, S.,Lee, M.W.,Cho, I.S.,Park, Y.D.,Lim, T.H.,Lee, S.R.,Jang, T.S. 한국분말야금학회 2011 한국분말재료학회지 (KPMI) Vol.18 No.1
In order to increase the coercivity of (Nd, Dy)-Fe-B sintered magnets without much reduction of remanence, small amount of Dy compounds such as $Dy_2O_3$ and $DyF_3$ was mixed with (Nd, Dy)-Fe-B powder. After mixing, the coercivity of (Nd, Dy)-Fe-B sintered magnets apparently increased with the increase of Dy compound in the mixture. Addition of $DyF_3$ was more effective than $Dy_2O_3$ for the improvement of coercivity. Reduction of the remanence by the addition of Dy compound, however, was larger than expected mostly due to unresolved coarse Dy compound in the magnet. EPMA analysis revealed that Dy was diffused throughout the grains in the magnet mixed with $DyF_3$ whereas Dy was rather concentrated around grain boundaries in the magnet mixed with $Dy_2O_3$.
(Nd, Dy)-Fe-B 소결자석의 성형조건에 따른 자기특성 변화
남궁석,이민우,한세준,장태석,NamKung, S.,Lee, M.W.,Han, S.J.,Jang, T.S. 한국분말야금학회 2012 한국분말재료학회지 (KPMI) Vol.19 No.1
In order to improve the remanence of (Nd, Dy)-Fe-B sintered magnets, we investigated the influence of compaction conditions such as packing density, applied field and green density on the magnetic properties. While the remanence decreased with increasing the packing density and green density, it increased with the increase of the applied field. In addition, XRD analysis revealed that the remanence was enhanced as the degree of powder alignment was improved. The green density was more influential on the remanence than the packing density and applied field.
Cu와 DyF<sub>3</sub> 분말의 혼합이 Nd-Fe-B 소결자석의 보자력에 미치는 영향
남궁석,이민우,임태환,김태훈,이성래,장태석,NamKung, S.,Lee, M.W.,Dhakal, D.R.,Lim, T.H.,Kim, T.H.,Lee, S.R.,Jang, T.S. 한국분말야금학회 2012 한국분말재료학회지 (KPMI) Vol.19 No.4
Effect of Cu and $DyF_3$ powder mixing with Cu-free (Nd, Dy)-Fe-B jet-milled powder on the magnetic properties of sintered magnets was investigated. The coercivity of a magnet prepared from the Cu-free (Nd, Dy)-Fe-B powder was about 10 kOe even though the alloy powder already contained some Dy (3.5 wt%). When small copper powder was blended, however, the coercivity of the magnet increased almost 100%, exhibiting about 20 kOe. On the contrary, the coercivity enhancement was moderate, about 4 kOe, when dysprosium content in the sintered magnet was simply increased to 4.9 wt% by the addition of small $DyF_3$3 powder.