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엄태형,고성만,서동수,양준환,박균하 한국세라믹학회 1993 한국세라믹학회지 Vol.30 No.6
The influence of reaction conditions on the MnZn ferrite coprecipitation process were investigated using mixed metla sulfate solution and ammonium oxalate. In order to minimize the metallic ion losses and to control the particle size, the optimum reaction conditions were as follows; reaction temperature $25^{\circ}C$, metal sulfate concentration 0.3M, molar ratio of ammonium oxalate/mixed metal sulfate 1.1:1. The production yield was as high as 97.6% of theoretical yield at optimum reaction condition.
엄태형,김삼중,서동수,Eom, Tae-Hyoung,Tuan, Huynh Thanh,Kim, Sam-Joong,Suh, Dong-Soo 한국재료학회 2010 한국재료학회지 Vol.20 No.6
The chemical formula of magnetite ($Fe_3O_4$) is $FeO{\cdot}Fe_2O_3$, t magnetite being composed of divalent ferrous ion and trivalent ferric ion. In this study, the influence of the coexistence of ferrous and ferric ion on the formation of iron oxide was investigated. The effect of the co-precipitation parameters (equivalent ratio and reaction temperature) on the formation of iron oxide was investigated using ferric sulfate, ferrous sulfate and ammonia. The equivalent ratio was varied from 0.1 to 3.0 and the reaction temperature was varied from 25 to 75. The concentration of the three starting solutions was 0.01mole. Jarosite was formed when equivalent ratios were 0.1-0.25 and jarosite, goethite, magnetite were formed when equivalent ratios were 0.25-0.6. Single-phase magnetite was formed when the equivalent ratio was above 0.65. The crystallite size and median particle size of the magnetite decreased when the equivalent ratio was increased from 0.65 to 3.0. However, the crystallite size and median particle size of the magnetite increased when the reaction temperature was increased from $25^{\circ}C$ to $75^{\circ}C$. When ferric and ferrous sulfates were used together, the synthetic conditions to get single phase magnetite became simpler than when ferrous sulfate was used alone because of the co-existence of $Fe^{2+}$ and $Fe^{3+}$ in the solution.
엄태형,김원석,김창범,전병용,이종열 한국세라믹학회 2007 한국세라믹학회지 Vol.44 No.9
The influence of P2O5 on clinker mineral composition and the cement quality was investigated. When the sewage sludge was usedas a raw material in place of clay, the presence of P2O5 in sewage sludge affects the mineral composition and the clinker quality. Asthe P2O5 concentration in raw mix increases, the burnability of clinker becomes worse and the alite decomposes into belite and free-CaO, so belite increases with the decrease of alite. The early strength of mortar decreases with the increase of P2O5 concentration. Onthe other hand, later-age strength increases with the increase of belite content. The setting time of cement was delayed with the P2O5concentration above 0.6 wt%.
P<sub>2</sub>O<sub>5</sub>가 클링커 광물조성 및 품질에 미치는 영향
엄태형,김원석,김창범,전병용,이종열,Eom, Tae-Hyoung,Kim, Won-Seok,Kim, Chang-Bum,Jeon, Byeong-Yong,Lee, Jong-Ryul 한국세라믹학회 2007 한국세라믹학회지 Vol.44 No.9
The influence of $P_2O_5$ on clinker mineral composition and the cement quality was investigated. When the sewage sludge was used as a raw material in place of clay, the presence of $P_2O_5$ in sewage sludge affects the mineral composition and the clinker quality. As the $P_2O_5$ concentration in raw mix increases, the burnability of clinker becomes worse and the alite decomposes into belite and free-CaO, so belite increases with the decrease of alite. The early strength of mortar decreases with the increase of $P_2O_5$ concentration. On the other hand, later-age strength increases with the increase of belite content. The setting time of cement was delayed with the $P_2O_5$ concentration above 0.6 wt%.
Fe<sub>3</sub>O<sub>4</sub> 생성에 미치는 황산제일철/황산제이철 몰비의 영향
엄태형,김삼중,안석진,오경환,서동수,Eom, Tae-Hyoung,Tuan, Huynh Thanh,Kim, Sam-Joong,An, Suk-Jin,Oh, Kyoung-Hwan,Suhr, Dong-Soo 한국재료학회 2011 한국재료학회지 Vol.21 No.4
The effect of ferrous/ferric molar ratio on the formation of nano-sized magnetite particles was investigated by a co-precipitation method. Ferrous sulfate and ferric sulfate were used as iron sources and sodium hydroxide was used as a precipitant. In this experiment, the variables were the ferrous/ferric molar ratio (1.0, 1.25, 2.5 and 5.0) and the equivalent ratio (0.10, 0.25, 0.50, 0.75, 1.0, 2.0 and 3.0), while the reaction temperature ($25^{\circ}C$) and reaction time (30 min.) were fixed. Argon gas was flowed during the reactions to prevent the $Fe^{2+}$ from oxidizing in the air. Single-phase magnetite was synthesized when the equivalent ratio was above 2.0 with the ferrous/ferric molar ratios. However, goethite and magnetite were synthesized when the equivalent ratio was 1.0. The crystallinity of magnetite increased as the equivalent ratio increased up to 3.0. The crystallite size (5.6 to 11.6 nm), median particle size (15.4 to 19.5 nm), and saturation magnetization (43 to 71 $emu.g^{-1}$) changed depending on the ferrous/ferric molar ratio. The highest saturation magnetization (71 $emu.g^{-1}$) was obtained when the equivalent ratio was 3.0 and the ferrous/ferric molar ratio was 2.5.
Spherical Recess Channel을 가진 MFMIS 구조의 하프니아 기반 강유전체 전계효과 트랜지스터 소자 특성 개선
엄태형(Taehyong Eom),김태호(Taeho Kim),김기욱(Giuk Kim),이상호(Sangho Lee),전상훈(Sanghun Jeon) 대한전자공학회 2021 대한전자공학회 학술대회 Vol.2021 No.6
Owing to superior complementary metal oxide semiconductor (CMOS) compatibility and high scalability, substantial research effort of HfO₂- based Ferroelectric have been put into the development of hafnia-based nonvolatile memory(NVM) devices. With regard to this, FeFET with various structure has been proposed. However, Metal / Ferroelectrics / Silicon (MFS), Metal / Ferroelectrics / Insulator / Silicon (MFIS) structure FeFET have limited memory window, reliability and switching speed property. The value of the capacitance of gate insulator is relatively lower than that of ferroelectrics, which induces most of the biased voltage drops in the gate dielectric layer. Here in, We exploit the Metal / Ferroelectric Layer / Metal / Insulator / Silicon (MFMIS) structure FeFET, in order to adjust capacitance ratio between gate insulator and ferroelectrics(CDE : CFE). We found the large memory window, high switching speed and high endurance in the MFMIS FeFET at a certain capacitance ratio (CDE : CFE). We believe the MFMIS FeFET can be a promising NVM device.