Jae Yong Jo, Muhammad A. Anugrah, Min Ho Kang, Junkyu Choi, Jae Gu Song, Tuson Park, Byeongwon Kang
언어
한국어(KOR)
URL
https://www.earticle.net/Article/A494001
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원문정보
초록
영어
The influence of BaTiO3 (BTO) addition on phase formation, microstructure, and flux pinning properties of Bi1.6Pb0.4Sr2Ca2Cu3O10+δ((Bi,Pb)-2223)) bulk superconductors were systematically investigated. Samples containing 00.7 wt% BTO were synthesized using the conventional solid-state method. Phase composition, microstructure, and elemental distribution were examined by X-ray diffraction (XRD), scanning electron microscopy (SEM), and energy-dispersive spectroscopy (EDS). Superconducting properties were evaluated through resistance-temperature and magnetization measurements, with the critical current density (Jc) determined from magnetic hysteresis loops using the Bean’s critical-state model. XRD analysis showed that increasing BTO content reduced the Bi-2223 phase fraction while promoting the formation of Bi-2212 and CaPbO4 secondary phases. SEM observations indicated that BTO addition modified the plate-like grain morphology and generally promoted grain refinement. EDS mapping showed distinct spatial distributions of Ba and Ti, suggesting partial decomposition of BTO and subsequent redistribution within the (Bi,Pb)-2223 matrix during sintering. Normalized pinning-force analysis demonstrated that at high magnetic fields, pure and 0.3 wt.% BTO samples exhibited close to normal point-pinning behavior, whereas other BTO-added samples showed behavior close to surface-pinning. Overall, these results confirm that BTO addition significantly modifies the phase evolution, microstructure, and flux pinning mechanisms of (Bi,Pb)-2223 bulk superconductors.
목차
Abstract 1. 서론 2. 실험 3. 결과 및 고찰 3.1. 상 형성 및 결정자 크기 3.2. 초전도 전이 특성 3.3. 표면 미세구조 및 원소 분포 3.4. 임계전류밀도 및 자속고정 4. 결론 ACKNOWLEDGMENT REFERENCES