Electrochemical oxidation of Y-Ba-Cu-O high-Tc superconductors

被引：0
|
作者：
Chudnovskii, FA
Malinenko, VP
Pergament, AL
Stefanovich, GB [1 ]
机构：
[1] Petrozavodsk State Univ, Petrozavodsk 185640, Russia
[2] Inst Physicotech, St Petersburg 194021, Russia
来源：
ELECTROCHIMICA ACTA | 1998年 / 43卷 / 12-13期
关键词：
high-T-c superconductor; YBa2Cu3O7-delta; oxygen deficiency; anodic oxidation; KNO3-NaNO3; melt;
D O I：
10.1016/S0013-4686(97)00315-0
中图分类号：
O646 [电化学、电解、磁化学];
学科分类号：
081704 ;
摘要：
The electrochemical oxidation of YBa2CU3O7-delta high-T-c, superconductor (both films and ceramics) in a KNO3-NaNO3 melt has been studied. Anodic polarization of nonsuperconducting oxygen-deficient films of about 2000 Angstrom thick at T = 360 degrees C, i = 50 mA cm(-2) for t approximate to 40 s leads to the appearance of superconductivity of the sample with T-c = 89 K. The estimation of temperature dependence of the oxidation efficiency is made and the optimum oxidation temperature it; found to be 350 degrees C. The efficiency of oxidation falls and anodic dissolution of the sample begins as the temperature decreases. For electrochemical oxidation in the melt at T greater than or equal to 350 degrees C, the oxidation efficiency is equal to similar to 1% for YBa2CU3O7-delta films and almost 100% for ceramics; This fact indicates an important role of the sample morphology and grain-boundary ionic transport in the process of electrochemical oxidation. (C) 1998 Elsevier Science Ltd. All rights reserved.
引用
收藏
页码：1779 / 1784
页数：6
相关论文
共 50 条
  • [41] SUPERCONDUCTIVITY STUDIES ON THE HIGH-TC PHASE IN THE Y-BA-CU-O SYSTEM
    RAO, GVS
    VARADARAJU, UV
    THOMAS, KA
    VIJAYASHREE, R
    RAJU, NP
    SRINIVASAN, R
    DE, U
    JANAKI, J
    RADHAKRISHNAN, TS
    JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS, 1987, 26 : 1077 - 1078
  • [42] CURRENT TRANSPORT IN HIGH-TC POLYCRYSTALLINE FILMS OF Y-BA-CU-O
    OGALE, SB
    DIJKKAMP, D
    VENKATESAN, T
    WU, XD
    INAM, A
    PHYSICAL REVIEW B, 1987, 36 (13): : 7210 - 7213
  • [43] PREPARATION AND PROPERTIES OF HIGH-TC SUPERCONDUCTING Y-BA-CU-O SYSTEMS
    HERRMANN, R
    KUBICKI, N
    SCHURIG, T
    DWELK, H
    PREPPERNAU, U
    KRAPF, A
    KRUGER, H
    MULLER, HU
    ROTHKIRCH, L
    KRAAK, W
    BRAUNE, W
    PRUSS, N
    NACHTWEI, G
    LUDWIG, F
    KEMNITZ, E
    PHYSICA STATUS SOLIDI B-BASIC RESEARCH, 1987, 142 (01): : K53 - K56
  • [44] ELECTRON-TUNNELING IN THE HIGH-TC SUPERCONDUCTOR Y-BA-CU-O
    ESCUDERO, R
    RENDON, L
    AKACHI, T
    BARRIO, RA
    TAGUENAMARTINEZ, J
    PHYSICAL REVIEW B, 1987, 36 (07): : 3910 - 3912
  • [45] NOVEL HIGH-TC SUPERCONDUCTING PHASE OF THE Y-BA-CU-O COMPOUND
    SEMBA, K
    TSURUMI, S
    HIKITA, M
    IWATA, T
    NODA, J
    KURIHARA, S
    JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS & EXPRESS LETTERS, 1987, 26 (04): : L429 - L431
  • [46] HIGH-TC SUPERCONDUCTIVITY IN PEROVSKITE OXIDES OF THE Y-BA-CU-O SYSTEM
    MOHANRAM, RA
    SREEDHAR, K
    RAYCHAUDHURI, AK
    GANGULY, P
    RAO, CNR
    PHILOSOPHICAL MAGAZINE LETTERS, 1987, 55 (06) : 257 - 263
  • [47] Structural investigation of high-Tc superconducting Y-Ba-Cu-O system
    Sato, S.
    Nakada, I.
    Kohara, T.
    Oda, Y.
    Proceedings of the Asia Pacific Physics Conference, 1988,
  • [48] SQUID BEHAVIOR AT LIQUID-NITROGEN TEMPERATURE IN HIGH-TC SUPERCONDUCTORS OF THE TYPE Y-BA-CU-O
    TICHY, R
    ODEHNAL, M
    PETRICEK, V
    SAFRATA, S
    POLLERT, E
    KAMARAD, J
    HEJTMANEK, J
    SMRCKOVA, O
    SYKOROVA, D
    JOURNAL OF LOW TEMPERATURE PHYSICS, 1988, 70 (1-2) : 187 - 190
  • [49] THERMAL-ANALYSIS IN THE Y-BA-CU-O, LA-BA-CU-O, PR-BA-CU-O SYSTEMS IN RELATION TO HIGH-TC SUPERCONDUCTORS
    COSTA, GA
    FERRETTI, M
    FRANCESCHI, EA
    OLCESE, GL
    THERMOCHIMICA ACTA, 1988, 133 : 17 - 22
  • [50] ELECTRON-ENERGY-LOSS SPECTRA OF THE HIGH-TC SUPERCONDUCTORS Y-BA-CU-O AND LA-SR-CU-O
    RAMSEY, MG
    NETZER, FP
    MATTHEW, JAD
    PHYSICAL REVIEW B, 1989, 39 (01): : 732 - 735
12345