## Abstract

The addition of Y_{2}BaCuO_{5} (211) particles to large grain YBa_{2}Cu_{3}O_{7-δ} (Y123) has significantly improved the critical current (J_{c}) in this material. Here a systematic quantitative analysis on the effect of the measured 211 present in large grains of Y123 has been performed, after the process of melt texturing, both on a microscopic and a nanoscopic scale with a systematic variation of the initial volume percent of 211 addition. From the correlation between critical current measurements and quantitative microscopy of both (001) and (110) sections, a maximum value of weighted J_{c} is observed corresponding to a measured Y123 volume percent of 20%. Although an increasing addition of 211 is effective in producing efficient flux pinning sites in the Y123 matrix, percolation paths in the Y123 matrix become limited for supercurrent. Accounting for the loss of liquid phase, we estimate an optimum initial volume of 211 for highest Jc to be 40%. Further correlation between the J_{c} and the true flux pinning force (Fp) shows a maximum pinning force for an initial 211 addition of 40%. However the pinning efficiency of the superconducting Y123 matrix is found to improve with an increasing 211 addition. Hence an optimum amount of 211 addition is essential for obtaining the best possible electrical characteristics in the superconducting composite.

Original language | English |
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Pages (from-to) | 327-332 |

Number of pages | 6 |

Journal | Materials Research Society Symposium - Proceedings |

Volume | 411 |

Publication status | Published - 1996 |

Event | Proceedings of the 1995 MRS Fall Meeting - Boston, MA, USA Duration: 1995 Nov 26 → 1995 Dec 1 |

## All Science Journal Classification (ASJC) codes

- Materials Science(all)
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering