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in creator/contributor: "Mueller, F. M. Fred M."  
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The influence of structural defects on intragranular critical currents of bulk MgB[sub 2].

Description: Bulk MgB2 samples were prepared under different synthesis conditions and analyzed by scanning and transmission electron microscopy. The critical current densities were determined from the magnetization versus magnetic field curves of bulk and powder-dispersed-in-epoxy samples. Results show that through a slow cooling process, the oxygen dissolved in bulk MgB2 at high synthesis temperatures can segregate and form nanometer-sized coherent precipitates of Mg(B,O)2 in the MgB2 matrix. Magnetization… more
Date: January 1, 2002
Creator: Serquis, A. (Adriana); Liao, Xiaozhou; Civale, L. (Leonardo); Zhu, Y. T. (Yuntian Theodore); Coulter, J. Y. (James Y.); Peterson, D. E. (Dean E.) et al.
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Partner: UNT Libraries Government Documents Department
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Critical currents, vortex dynamics and microstructure in MgB[sub 2].

Description: One key issue in optimizing critical current density (J,) in MgB2 is to determine which structural features are the relevant pinning centers. Likely sources of vortex pinning include grain boundaries and intra-grain defects. Detailed studies of the field (H) and temperature (T) dependence of pinning in microstructurally well-characterized samples are required to clarify this point. In this work we explore the influence of microstructures on the vortex dynamics of MgB2 bulk samples prepared eith… more
Date: January 1, 2002
Creator: Serquis, A. (Adriana); Civale, L. (Leonardo); Liao, Xiaozhou; Maley, M. P. (Martin P.); Zhu, Y. T. (Yuntian Theodore); Nesterenko, V. F. et al.
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Partner: UNT Libraries Government Documents Department
open access

Characterizing transport current defects in 1-cm-wide YBa[sub 2]Cu[sub 3]O[sub 7-delta] coated conductors.

Description: We have used a low temperature magnetic imaging system to determine current pathways in 5 cm long 'good' and 'bad' regions of a 1-cm-wide YBa2Cu3O7-{delta} coated conductor. The good and bad regions were identified with 4 point probe measurements taken at 1 cm intervals along the tape length. The current density map from the good region showed the expected edge peaked structure, similar to that seen in previous work on high quality test samples grown on single crystal substrates. The structure … more
Date: January 1, 2001
Creator: Brown, G. W. (Geoffrey W.); Hawley, M. E. (Marilyn E.); Peterson, E. J. (Eric J.); Coulter, J. Y. (James Y.); Dowden, P. C. (Paul C.); Arendt, P. N. (Paul N.) et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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