Materials developments and applications of Bulk RE-Ba-Cu-O superconductors

Research output: Chapter in Book/Report/Conference proceedingChapter

4 Citations (Scopus)

Abstract

Before the discovery of high-temperature superconductors (HTSs), the applications of bulk superconductors were generally deemed not practical mainly due to their low cryostability [1]. However, the discovery of HTS changed such a situation. The thermal stability of HTS is extremely high because of their large thermal capacity. The stability is also greatly enhanced when they are used at higher temperatures. The simplicity of one of the earliest demonstrations of HTS, the levitation of a permanent magnet over a bulk Y-Ba-Cu-O, as shown in Fig. 1, started researchers seeking for their potential applications. During the past fifteen years, researchers have made significant improvements in the materials properties of bulk HTSs and have investigated the feasibility of their use in various engineering applications. The combination of permanent magnets and HTS enabled us to construct magnetic bearings with a low-loss rotation that are installed in prototype highefficiency flywheels. Bulk HTSs have demonstrated the ability to trap magnetic flux, and some samples have exhibited surface magnetic fields approximately an order of magnitude higher than presently used permanent magnets. The performance of bulk HTS materials is given by the following equation: M =A Jc r (1) where M is magnetization and stands for the performance of bulk materials, A is a geometrical constant, Jc the critical current density, and r the radius of single domain or the radius of a current loop. Thus in order to improve the performance of bulk HTS, one needs to increase Jc or the size of bulk HTS.

Original languageEnglish
Title of host publicationFrontiers in Superconducting Materials
PublisherSpringer Berlin Heidelberg
Pages869-884
Number of pages16
ISBN (Print)3540245138, 9783540245131
DOIs
Publication statusPublished - 2005

Fingerprint

high temperature superconductors
permanent magnets
flywheels
magnetic bearings
radii
levitation
magnetic flux
critical current
thermal stability
prototypes
traps
engineering
current density
magnetization
magnetic fields

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Murakami, M. (2005). Materials developments and applications of Bulk RE-Ba-Cu-O superconductors. In Frontiers in Superconducting Materials (pp. 869-884). Springer Berlin Heidelberg. https://doi.org/10.1007/3-540-27294-1_23

Materials developments and applications of Bulk RE-Ba-Cu-O superconductors. / Murakami, Masato.

Frontiers in Superconducting Materials. Springer Berlin Heidelberg, 2005. p. 869-884.

Research output: Chapter in Book/Report/Conference proceedingChapter

Murakami, M 2005, Materials developments and applications of Bulk RE-Ba-Cu-O superconductors. in Frontiers in Superconducting Materials. Springer Berlin Heidelberg, pp. 869-884. https://doi.org/10.1007/3-540-27294-1_23
Murakami M. Materials developments and applications of Bulk RE-Ba-Cu-O superconductors. In Frontiers in Superconducting Materials. Springer Berlin Heidelberg. 2005. p. 869-884 https://doi.org/10.1007/3-540-27294-1_23
Murakami, Masato. / Materials developments and applications of Bulk RE-Ba-Cu-O superconductors. Frontiers in Superconducting Materials. Springer Berlin Heidelberg, 2005. pp. 869-884
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