C.-J. Kim, S.-D. Park, B.-H. Jun, B. G. Kim, K.-N. Choo, H.-C. Ri
언어
한국어(KOR)
URL
https://www.earticle.net/Article/A216296
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원문정보
초록
영어
Effects of neutron irradiation on the superconducting properties of the undoped MgB2 and the carbon(C)-doped MgB2 bulk superconductors, prepared by an in situ reaction process using Mg and B powder, were investigated. The prepared MgB2 samples were neutron-irradiated at the neutron fluence of 1016-1018 n/cm2 in a Hanaro nuclear reactor of KAERI involving both fast and thermal neutron. The magnetic moment-temperature (M-T) and magnetization-magnetic field (M-H) curves before/after irradiation were obtained using magnetic property measurement system (MPMS). The superconducting critical temperature (Tc) and transition width were estimated from the M-T curves and critical current density (Jc) was estimated from the M-H curves using a Bean’s critical model. The Tcs of the undoped MgB2 and C-doped MgB2 before irradiation were 36.9-37.0 K and 36.6-36.8 K, respectively. The Tcs decreased to 33.2 K and 31.6 K, respectively after irradiation at neutron fluence of 7.16×1017 n/cm2, and decreased to 22.6 K and 24.0 K, respectively, at 3.13×1018 n/cm2. The Jc cross-over was observed at the high magnetic field of 5.2 T for the undoped MgB2 irradiated at 7.16×1017 n/cm2. The Tc and Jc variation after the neutron irradiation at various neutron fluences were explained in terms of the defect formation in the superconducting matrix by neutron irradiation.
목차
Abstract 1. 서론 2. 실험방법 2.1. MgB2 시편 제조와 물성 측정 2.2. 중성자 조사 시험 3. 결과 및 고찰 4. 결론 ACKNOWLEDGMENT REFERENCES
키워드
MgB2 superconductorin situ processcarbon dopingneutron irradiationsuperconducting temperaturecritical current density
저자
C.-J. Kim [ Neutron Science Division, Korea Atomic Energy Research Institute, Daejeon, Korea ]
Corresponding author
S.-D. Park [ Neutron Science Division, Korea Atomic Energy Research Institute, Daejeon, Korea ]
B.-H. Jun [ Neutron Science Division, Korea Atomic Energy Research Institute, Daejeon, Korea ]
B. G. Kim [ Neutron Utilization Technology Division, Korea Atomic Energy Research Institute, Daejeon, Korea ]
K.-N. Choo [ Advanced Nuclear Fuel Development Division, Korea Atomic Energy Research Institute, Daejeon, Korea ]
H.-C. Ri [ Physics Department, Kyungpook National University, Daegu, Korea ]