Characterization of natural and artificial low-angle boundaries in YBCO TSMG samples

被引:38
作者
Delamare, MP
Walter, H
Bringmann, B
Leenders, A
Freyhardt, HC
机构
[1] Univ Gottingen, Inst Met Phys, D-37073 Gottingen, Germany
[2] Zentrum Funktionswerkstoffe Gottingen, D-37073 Gottingen, Germany
来源
PHYSICA C | 2000年 / 329卷 / 03期
关键词
melt-textured superconductors; Y-based cuprates; welding; low-angle boundaries;
D O I
10.1016/S0921-4534(99)00454-2
中图分类号
O59 [应用物理学];
学科分类号
摘要
Since several years, technical applications of bulk HTS YBCO superconductors are of growing interest. However, shapes of HTS tiles needed for complex applications require the joining of two or more single-domain monoliths. The welding technique leads to the formation of a low-angle grain boundary and then requires a high connectivity between two adjacent single-domain materials. This study was devoted to the characterization of the microstructure and the superconducting properties of natural and artificial low-angle grain boundaries. The natural grain boundary formed during the multi-seeded melt growth (MSMG) process exhibits a non-uniform microstructure during the growth. An energy dispersive spectroscopy (EDS) analysis carried out across the grain boundaries always reveals a depletion of copper and an accumulation of yttrium. Mechanical joining of two single-domain monoliths leads to the formation of an artificial grain boundary. This kind of joining was performed either without or with a welding agent, i.e., YbBa2Cu3O7-x (Yb-123), The first method leads to a good connectivity between welded Y-123 platelets. In contrast, the control of the mechanical welding process with a welding agent is more difficult. At 940 degrees C, Yb-123 decomposes into Yb2BaCuO5, BaCuO2 and CuO. This decomposition deteriorates the superconducting properties between two adjacent domains. (C) 2000 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:160 / 177
页数:18
相关论文
共 31 条
  • [1] ATHUR SP, 1998, UNPUB J SUPERCO 0514
  • [2] CATALAN D, ICMAS 91
  • [3] Combination of CeO2 and PtO2 doping for strong enhancement of J(c) under magnetic field in melt-textured superconductor YBaCuO
    Delamare, MP
    Hervieu, M
    Wang, J
    Provost, J
    Monot, I
    Verbist, K
    VanTendeloo, G
    [J]. PHYSICA C, 1996, 262 (3-4): : 220 - 226
  • [4] Influence of CeO2, BaCeO3 or PtO2 additions on the microstructure and the critical current density of melt processed YBCO samples
    Delamare, MP
    Monot, I
    Wang, J
    Provost, J
    Desgardin, G
    [J]. SUPERCONDUCTOR SCIENCE & TECHNOLOGY, 1996, 9 (07) : 534 - 542
  • [5] In-situ YBa2Cu3Ox growth rate analysis
    GautierPicard, P
    Beaugnon, E
    Tournier, R
    [J]. PHYSICA C, 1997, 276 (1-2): : 35 - 41
  • [6] HAASEN P, 1986, PHYS METALL
  • [7] FORMATION PROCESSES OF POLYCRYSTALLINE LABA2CU3OX, NDBA2CU3OX, SMBA2CU3OX, EUBA2CU3OX, GDBA2CU3OX, DYBA2CU3OX, HOBA2CU3OX, ERBA2CU3OX, TMBA2CU3OX, YBBA2CU3OX AND LUBA2CU3OX
    ITOH, T
    UZAWA, M
    UCHIKAWA, H
    [J]. JOURNAL OF CRYSTAL GROWTH, 1988, 91 (03) : 397 - 401
  • [8] HIGH CRITICAL CURRENTS IN Y-BA-CU-O SUPERCONDUCTORS
    JIN, S
    TIEFEL, TH
    SHERWOOD, RC
    DAVIS, ME
    VANDOVER, RB
    KAMMLOTT, GW
    FASTNACHT, RA
    KEITH, HD
    [J]. APPLIED PHYSICS LETTERS, 1988, 52 (24) : 2074 - 2076
  • [9] Y2BACUO5 MORPHOLOGY IN MELT-TEXTURED Y-BA-CU-O OXIDES WITH PTO2H2O/CEO2 ADDITIONS
    KIM, CJ
    KIM, KB
    HONG, GW
    [J]. PHYSICA C, 1994, 232 (1-2): : 163 - 173
  • [10] MORPHOLOGY OF Y2BACUO5 AND SEGREGATION OF 2ND PHASE PARTICLES IN MELT-TEXTURED Y-BA-CU OXIDES WITH WITHOUT BACEO3 ADDITION
    KIM, CJ
    LAI, SH
    MCGINN, PJ
    [J]. MATERIALS LETTERS, 1994, 19 (3-4) : 185 - 191