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치환형 Sr - Ba 육방 페라이트들의 자기적 성질에 수소환원이 미치는 효과에 관한 Mossbauer 분광학적 연구
박재윤(J. Y. Park),권명희(M. H. Kwon),이재광(J. G. Lee) 한국자기학회 1999 韓國磁氣學會誌 Vol.9 No.1
Sr substituted materials for some barium in M-type barium ferrite powder and Co-Ti substituted Sr-Ba hexagonal ferrite powder were prepared by citrate sol-gel method and 2 MOE sol-gel method. These hexaferrite particles were reduced for 1hr in the hydrogen gas. The reduction temperatures were varied in the range of 250 ℃ to 500 ℃. X-ray diffraction patterns were measured using diffractometer with Cu Kα radiation. Mossbauer absorption spectra were measured with a constant acceleration spectrometer. We have focused on studying the origin of increasing Ms by Mossbauer spectroscopy. Ferrite particles which were sintered at 1050 ℃ were found to be typical magnetoplumbite structure and single phase. XRD patterns with varying the reduction temperatures in Sr_(0.5)Ba_(0.5)Fe_(10)O_(19) indicates ferrites particles become composite hexaferrites containing α-Fe at Tred. = 350 ℃. On the otherhand, it was found that Co²+ ions and Ti⁴+ ions in Sr_(0.7)Ba_(0.3)Fe_(10)CoTiO_(19) prevent from changing Fe³+ ions to α-Fe during the H₂ reduction. Comparing Mossbauer results with XRD results, we have determined most of α-Fe are reduced from 4fvi sites and 12k sites of Fe³+ ions. These α-Fe phase bring the induced anisotropy and increase saturation magnetization Ms.
박재윤(Park. J.P),정장근(Jung. J.G),김종석(Kim. J.S),이용길(Lee. Y.G),김광태(Kim. K.T) 한국조명·전기설비학회 2004 한국조명·전기설비학회 학술대회논문집 Vol.2004 No.5월
We studied the effect of the type of non-thermal plasma on the decomposition of CF₄. 3 types of reactors were manufactured to generate different types of plasma respectively, and went into the experiments. As the results, we found that high density of the energy of non-thermal plasma and the minimization of non-discharged area should be met in order to elevate decomposition rate of CF₄. Among the reactors used in the study, the hole-type reactor was such one that satisfying that requirement. Using the hole-type reactor, treatment efficiency for high concentration of CF₄ was excellent. We got decomposition rate of more than 95[%] between 500[ppm] around and less than 400[ppm], and up to 85[%] at 900[ppm].