Journal of Superconductivity

, Volume 5, Issue 2, pp 95–99 | Cite as

Effect of Ho addition on the properties of Y-system superconductors

  • Feng Yong
  • Zhou Lian
  • Zhang Pingxiang
  • Ji Ping
  • Wu Xiaozu
  • Luo Changxun
  • Xing Mianrong
Article

Abstract

(YHo)Ba2Cu3O7−y is prepared by the powder melting process and its properties are investigated. It is found that Ho addition can change the melting temperature of a Y-system superconductor. TheJ c values of YBCO can be improved by Ho substitution, which is due to the effect of Ho addition on the number and quality of grain boundaries and the size and distribution of 211 particles. The highestJ c value was found to be 50,000 A/cm2 (77 K, 1T,H⊥I) in Y0.8Ho0.2Ba2Cu3O7−y. Our results indicate that the number and quality of grain boundaries have a great influence on the superconducting properties. A discussion is given on the relationship betweenJ c and the size and phase proportion of 211 particles. There are a lot of dense twins in the sample, and many crystal defects exist around the 211 phase.

Key words

YBCO Ho addition critical current density 

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Copyright information

© Plenum Publishing Corporation 1992

Authors and Affiliations

  • Feng Yong
    • 1
  • Zhou Lian
    • 1
  • Zhang Pingxiang
    • 1
  • Ji Ping
    • 1
  • Wu Xiaozu
    • 1
  • Luo Changxun
    • 2
  • Xing Mianrong
    • 2
  1. 1.Northwest Institute for Nonferrous Metal ResearchBaoji ShaanxiChina
  2. 2.Shaanxi Normal UniversityXian ShaanxiChina

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