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Magnetic properties of Mn-doped Bi<sub>2</sub>Te<sub>3</sub> and Sb<sub>2</sub>Te<sub>3</sub>
Choi, Jeongyong,Choi, Sungyoul,Choi, Jiyoun,Park, Yongsup,Park, Hyun-Min,Lee, Hee-Woong,Woo, Byung-Chul,Cho, Sunglae WILEY-VCH Verlag 2004 Physica status solidi. PSS. B, Basic solid state p Vol.241 No.7
<P>We have fabricated Mn-doped Bi<SUB>2</SUB>Te<SUB>3</SUB> and Sb<SUB>2</SUB>Te<SUB>3</SUB> single crystals by the vertical gradient solidification method. The compositions and crystal structures of Bi<SUB>2−x</SUB>Mn<SUB>x</SUB>Te<SUB>3</SUB> and Sb<SUB>2−x</SUB>Mn<SUB>x</SUB>Te<SUB>3</SUB> were determined using Electron Probe Micro-Analyzer (EPMA) and powder X-ray diffraction (XRD) patterns, respectively. Both crystal structures were rhombohedral with smaller lattice constants because of the smaller atomic radius of Mn than those of Bi and Sb. Based on the magnetization measurements, Mn-doped Bi<SUB>2</SUB>Te<SUB>3</SUB> and Sb<SUB>2</SUB>Te<SUB>3</SUB> compounds have ferromagnetic ordering at T<SUB>C</SUB> = 10 and 17 K, respectively. (© 2004 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)</P>
Development of high-temperature combustion system with DC arc plasma torches
Daehyun Choi,In Je Kang,Jihun Kim,Soon-Mo Hwang,Yongsup Choi 한국진공학회 2021 한국진공학회 학술발표회초록집 Vol.2021 No.2
The high-temperature waste decomposition system with plasma torches was constructed to derive a research to overcome the problems which cannot be treated with conventional waste treatment technology. The system consisted of waste feeder, plasma reactor, heat exchanger and gas analyzer and so on. The plasma was generated at atmospheric pressure using 30 kW and 60 kW DC arc torches. It is capable of processing up to 60 kg/hr waste and is designed to 2000°C temperature inside reactor. In this presentation, the developed high-temperature system for waste decomposition will be discussed.