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자료유형
학술저널
저자정보
Ko, Y.J. (Department of Physics, Chungbuk National University) Oh, J.Y. (Department of Physics, Chungbuk National University) Song, C.Y. (Department of Physics, Chungbuk National University) Yang, D.S. (Department of Physics Education, Chungbuk National University) Tran, D.H. (Faculty of Physics, VNU University of Science) Kang, B. (Department of Physics, Chungbuk National University)
저널정보
한국초전도저온학회 한국초전도·저온공학회논문지 한국초전도·저온공학회논문지 제21권 제4호
발행연도
2019.1
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1 - 5 (5page)

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We investigated the effect of Fe3O4 addition on the critical temperature of (Bi, Pb)-2223 polycrystalline samples. Bi1.6Pb0.4Sr2Ca2Cu3O10+δ + x wt. % Fe3O4 (x = 0.0, 0.2, 0.4, 0.6, and 0.8) samples were prepared by using a solid-state reaction method. The analysis of X-ray diffraction data indicates that as Fe3O4 is added, dominant phase of the sample changes from Bi-2223 to Bi-2212 with an increasing Bi-2201 phase. The transition temperature of the samples drastically decreased with the Fe3O4 addition. The resistance data of samples with x = 0.2 and 0.4 showed a double transition indicating a coexistence of Bi-2223 and Bi-2212 phase while the samples with x = 0.6 and 0.8 showed a single transition with a semiconducting behavior. This phase transition may originate from changes in local structure of the Bi-2223 system by Fe3O4 addition. Analysis of the pair distribution function of the Cu-O pair in the CuO2 plane calculated from extended X-ray absorption fine structure data revealed that the oxygen coordination of copper ion changes from CuO4 planar type (x = 0.0 - 0.4) to CuO5 pyramidal type (x = 0.6, 0.8). The correlated Debye-Waller factor, providing information on the atomic disorder within the CuO2 plane, shows an inverse relation to the coordination number. These results indicate that addition of Fe3O4 changes the oxygen distribution around Cu in the CuO2 plane, causing a phase transition from Bi-2223 to more stable Bi-2212/Bi-2201 phases.

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