日本結晶成長学会誌
Online ISSN : 2187-8366
Print ISSN : 0385-6275
ISSN-L : 0385-6275
43 巻 , 1 号
選択された号の論文の18件中1~18を表示しています
巻頭言
特集:結晶構造・結晶薄膜デザインによる次世代エネルギー関連材料開発
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  • 下山 淳一
    2016 年 43 巻 1 号 p. 4-15
    発行日: 2016年
    公開日: 2017/06/13
    ジャーナル フリー

      Since the discovery of high-Tc cuprate superconductors 30 years ago, their practical applications particularly for saving and storing energy have been expected. However, high-Tc superconducting materials had required very long time before their extensive applications, because of many intrinsic difficulties to achieve enough high critical current performance originated in large anisotropic characteristics, short coherence length and large nonstoichiometry in chemical compositions. Fabrication of polycrystalline superconducting tapes having highly grain-aligned microstructure and well controlled chemical composition is crucially important for deriving potentials of superconductors. Even now, eager efforts have been made to improve synthesis processes for producing long length tapes with high uniformity, high reliability and low cost.

      In this review paper, current status of high-Tc superconducting materials and their practical applications mainly for Bi2223 superconducting tapes are shown after brief introduction of superconductors, metallic superconducting materials and characteristic features of cuprate superconductors.

  • 寺西 亮
    2016 年 43 巻 1 号 p. 16-26
    発行日: 2016年
    公開日: 2017/06/13
    ジャーナル フリー

      REBa2Cu3O7-δ (REBCO, RE: rare earth elements) superconductors have been considered as the candidate for electric power industries such as power cable and high magnet coil application, because of their high critical current with zero resistance at temperature beyond liquid nitrogen temperature. REBCO wires consisted of superconducting thin films with highly crystal grain alignment and high critical current density in high external magnetic fields are required for the electric power applications. In this report, the growth techniques for REBCO superconductor single crystals and REBCO thin films are described. The Solute-Rich-Liquid Crystal Pulling (SRL-CP) method is a good technique for the fabrication of high quality large REBCO single crystals. The REBCO single crystals grown by this method have been applied to the scientific materials characterization. On the other hand, highly oriented REBCO thin films have been fabricated using a metal organic deposition (MOD) technique. Flux pinning centers are introduced artificially into the films through MOD process to enhance critical current density in magnetic fields.

  • 堀井 滋, 土井 俊哉
    2016 年 43 巻 1 号 p. 27-34
    発行日: 2016年
    公開日: 2017/06/13
    ジャーナル フリー

      Magnetic alignment using static magnetic field (SF) and modulated rotating magnetic field (MRF) enables formation of uni-axial and tri-axial grain arrangement at room temperature for substances with magnetic anisotropy, respectively. In this review article, we introduce two topics to show high potential of combination of magnetic alignment and colloid processes. The former topic is uni-axial orientation of a layered thermoelectric (TE) cobaltite by electrophoretic deposition in SFs. Using this technique, the fabrication of multilayered TE module containing c-axis-oriented cobaltite layer is demonstrated. The latter topic is the fabrication of tri-axially grain-aligned ErBa2Cu4O8 (Er124) green pellets by slip-casting under MRFs. The degrees of tri-axial orientation are sensitive to viscosities of suspensions. So far, an Er124 green pellet with the degree of inplane orientation with ~7° has been successfully fabricated by control of viscosity of suspensions and introduction of oscillation type of MRF.

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