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자성 반도체 CoxFe_1-x Cr_2S_4의 전기적 특성에 관한 연구
서정철 圓光大學校 基礎自然科學硏究所 1988 基礎科學硏究誌 Vol.7 No.3
CoxFe_(1-x) Cr_2S_4 (0?X?1)시료를 진공중에 직접 합성법으로 제조하여 X선 회절법 Mossbauer 분광법, 자화율 측정법과 전기 전도도 측정법을 사용하여 연구하였다. 결정구조는 입방 spinel 구조이고 격자상수 a_0는 9.985Å∼9.927Å의 값을 갖고 있다. Mo ssbauer spectra와 자기 모우먼트 값을 액체 질소 온도에서부터 고온까지 여러온도에서 측정한 결과, 철 이온은 +2가 로서 사면체 자리에만 들어가고 초미세 자기장과 자기 모우먼트 값이 온도 상승과 더불어 같은 비율로 감소하는 사실을 발견 했으며, 자기적 정렬의 본질은 준 강자성체 임을 알았다. 온도에 따른 비 저항의 변화를 측정하여 반도체임을 확인하고 활성화 에너지는 큐리온도 이상과 이하에서 각각 0.039 eV ∼ 0.079eV, 0.014eV ∼ 0.052eV로 측정되었다. The mixed spinel system Cox Fe_(1-x) Cr_2S_4 (0〈 X〈 1) has been studied using X_rays, Mssbauer, magnetic and resistivity measurements. The crystal structure is cubic spinel and the lattice constant a_0 is found to be 9.985Å∼ 9.927Å. Mossbauer spectra, magnetic moments and resistivities have been collected from 82 K to high temperature. Fe ions are ferrous in character and occupy only tetrahedral sites. The magnetic hyperfine fields and magnetic moments decreasing with increasing temperature and it is found that the magnetic-ordering is characteristic of ferrimagnetic material. Temperature dependence of the resistivity indicates that the sampls are semiconductors and activation energies are determined to be 0.039 eV∼0.079 eV, 0.014 eV∼0.052 eV, respectively, in the higher-and lower-than-magne-tic-ordering-temperature regions.
자성 반도체 Co_0.9 Fe_0.1 Cr_2 S_4의 Mo"ssbauer 분광학적 연구
서정철 圓光大學校 基礎自然科學硏究所 1988 基礎科學硏究誌 Vol.7 No.1
The crystallographic and magnetic properties of Co_0.9 Fe_0.1 Cr_2 S_4 have been studied by Mossbauer and x-ray measurements. The crystal structure is cubic spinel and the lattice parameter a。. It is also found that iron ions occupy only tetrahedral sites. The magnetic hyperfine field and qudrupole shift at 81K was found to be 197.8 kOe and 0.63 ㎜/s, respectively. Magnetic ordering of ferrimagnetic nature exists below the Curie temperature of 219 K. It is notable that quadrupole splitting appears below the Curie temperature and increase with decreasing temperature and asymmetric line broading in Mossbauer spectra also increases with decreasing temperature; it is suggested that these are dynamic John-Teller distortion.
자성 반도체 Cox Fel - x Cr₂S₄의 전기적 특성에 관한 연구
서정철 圓光大學校 1987 論文集 Vol.21 No.2
CoxFe?? Cr?S? ( 0≤X≤1)시료를 진공중에 직접 합성법으로 제조하여 X선 회절법 Mossbauer 분광법, 자화율 측정법과 전기 전도도 측정법을 사용하여 연구하였다. 결정구조는 입방 spinel 구조이고 격자상수 a?는 9.985Å ∼9.927Å 의 값을 갖고 있다. Mossbauer spectra 와 자기 모우먼트 값을 액체 질소 온도에서 부터 고온까지 여러 온도에서 측정한 결과, 철 이온은 +2가 로서 사면체 자리에만 들어가고 초미세 자기장과 자기 모우먼트 값이 온도 상승과 더불어 같은 비율로 감소하는 사실을 발견 했으며, 자기적 정렬의 본질은 준 강자성체 임을 알았다. 온도에 따른 비 저항의 변화를 측정하여 반도체임을 확인하고 활성화 에너지는 큐리온도 이상과 이하에서 각각 0.039 eV∼0.079eV, 0.014eV∼0.052eV로 측정되었다. The mixed spinel system Cox ?? ?? ( 0 <X <1 ) has been studied using X-rays, Mossbauer, magnetic and resistivity measurements. The crystal structure is cubic spinel and the lattice constant ?? is found to be 9.985 Å ∼9.927Å. Mossbauer spectra, magnetic moments and resistivities have been collected from 82K to high temperature. Fe ions are ferrous in character and occupy only tetrahedral sites. The magnetic hyperfine fields and magnetic moments decreasing with increasing temperature and it is found that the magnetic-ordering is characteristic of ferrimagnetic material. Temperature dependence of the resistivity indicates that the samples are semiconductors and activation energies are determined to be 0.039 eV∼0.079eV, 0.014eV∼0.052eV, respectively, in the higher-and lower-than-magnetic-ordering-temperature regions.
거자법(巨刺法)위주의 침치료(鍼治療)가 뇌졸중(腦卒中) 환자(환자)의 기능 회복에 미치는 영향(影響)
서정철,정병식,윤형석,조성규,김윤미,김종인,이윤호,Seo, Jung-Chul,Cheong, Byung-Shik,Yun, Hyong-Seok,Cho, Seong-Gyu,Kim, Youn-Mi,Kim, Jong-In,Lee, Yun-Ho 대한침구의학회 2001 대한침구의학회지 Vol.18 No.3
Objective : In order to study the effect of contralateral acupuncture on recovery of motor disorders in stroke patients a clinical study was performed. Methods : Thirteen patients with poststroke-hemiplegia were randomized into two groups. Six patients(test group) treated with contralateral acupuncture. The other seven patients(control group) treated with ipsilateral acupuncture. The activity of daily living was measured with a modified barthel index(MBI). The therapy was performed one a day for 3 weeks. Results : In terms of improvement of activity of daily living, the test group showed statistically meningful increase after 1 week treatment. but the control group showed statistically meningful increase after 2 weeks(p<0.05). In terms of score of MBI, the groups showed no statistically meningful difference after 3 week treatment. Conclusions : These results support that contralateral acupuncture therapy has almost same effectness compared with ipsilateral acupuncture therapy in improvement of the activity of daily living of poststroke-hemiplegic patients.