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상온 및 액체질소 온도에서 고속 중성자 조사된 원자로 압력 용기의 취화 현상에 관한 연구
김형배(H. B. Kim),김형상(H. S. Kim),김순구(S. K. Kim),신동훈(D. H. Shin),유연봉(Y. B. Yu),고정대(J. D. Ko) 한국자기학회 2005 韓國磁氣學會誌 Vol.15 No.2
The embrittlement of fast neutron-irradiated reactor pressure vessel (RPV) steels was investigated by X-ray diffraction patterns at room temperature and Mossbauer spectroscopy at room- and liquid nitrogen-temperature. Neutron fluence on the samples were 10¹², 10¹³, 10¹⁴, 10^(15), 10^(16), 10^(17), 10^(18) n/㎠. The X-ray diffraction patterns showed that the structure of the neutron unirradiated sample was bcc type, where as but the neutron irradiated samples with the fluence higher than 1017 n/㎠ were so severely damaged, that bcc type structure disappeared. The Mossbauer spectra of all samples showed superposition of two or more sextets. In this paper all Mossbauer spectra were fitted by three set of sextet. The isomer shift and quadrupole splitting values were found around zero. At liquid nitrogen temperature, magnetic hyperfine field and absorption area increase rapidly S1 sextet in the samples of 1017~1018 n/㎠ neutron fluences. And at room temperature, magnetic hyperfine field and absorption increased rapidly at S1 sextet in the samples of 1017~1018 n/㎠ neutron fluences. This rapid increase of magnetic hyperfine field and absorption area were inferred to be caused by the change of (56)^Fe, (55)^Mn into (57)^Fe due to by neutron irradiation.
소결온도 변화와 충전된 리튬이온 전지 LiFePO₄ 정극에 대한 뫼스바우어 효과
김태희(T. H. Kim),김형상(H. S. Kim),임현식(H. S. Im),유연봉(Y. B. Yu) 한국자기학회 2007 韓國磁氣學會誌 Vol.17 No.2
In this paper, we composed the LiFePO₄ for the reversible use as the replacement material of the Li ion batteries and confirmed the good quality of the structure of the samples with the sintering temperature 675 ℃, 750 ℃, and 800 ℃ for 30 hours at nitrogen atmosphere. We also investigated the size of the particles through SEM picture and the change of the sintering temperature and the Fe<SUP>+3</SUP> content after charging the materials with 1 V, 160 ㎃ and 3 V, 40 ㎃ for 3 hours by Mossbauer spectroscopy. Also we can observe the increase on the Fe<SUP>+3</SUP> content at the charge condition and the increase of the amount ratio of the Fe<SUP>+3</SUP> ion only in sintering temperature 675 ℃ according to the increase of the electric charge. We cannot observe the change of the Fe<SUP>+3</SUP> ion in sintering temperature 800 ℃ after charging.