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Relation Between the Characteristics of Powder and Microstructure; Properties of Ceramics for YBa2Cu2Ox Superconductors

Published online by Cambridge University Press:  28 February 2011

Meiyu Zhao
Affiliation:
Shanghai Institute of Ceramics, Chinese Academy of Sciences Shanghai 200050, P.R.China
Chengen Li
Affiliation:
Shanghai Institute of Ceramics, Chinese Academy of Sciences Shanghai 200050, P.R.China
Xingyun Jin
Affiliation:
Shanghai Institute of Ceramics, Chinese Academy of Sciences Shanghai 200050, P.R.China
Yeming Huang
Affiliation:
Shanghai Institute of Ceramics, Chinese Academy of Sciences Shanghai 200050, P.R.China
Enji Zhou
Affiliation:
Shanghai Institute of Ceramics, Chinese Academy of Sciences Shanghai 200050, P.R.China
Huanyao Ni
Affiliation:
Shanghai Institute of Ceramics, Chinese Academy of Sciences Shanghai 200050, P.R.China
Yaoming Qu
Affiliation:
Shanghai Institute of Ceramics, Chinese Academy of Sciences Shanghai 200050, P.R.China
Xiangyun Song
Affiliation:
Shanghai Institute of Ceramics, Chinese Academy of Sciences Shanghai 200050, P.R.China
Wenjun Wu
Affiliation:
Shanghai Institute of Ceramics, Chinese Academy of Sciences Shanghai 200050, P.R.China
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Abstract

Four kinds of YBa2Cu2Ox (YBCO) superconducting powders with different particle sizes, shapes and different amounts of twins have been prepared in this work. The density, grain sizes, XRD of phase composition, configuration of twins of the ceramics have been investigated. The relation between the characteristics of YBCO powders and the microstructure, current density of the bulk materials are also discussed. In contrast to the YBCO powder prepared by solid state method, the YBCO powders through the improved coprecipitat ion approach have less impurities, smaller particle size and much more amounts of twins, as well as the sintered pellets show a higher density, an orthorhombic single phase, and moreover, the pellets have finer grain boundaries and well developed twins. As a result these samples exhibit current densities (about 1500 A/cm2) higher than those prepared by solid state method. Using BaOx instead of BaCO3 as the starting material, a more dense bulk YBCO ceramics with orthorhombic single phase and Jc (about 1,000 A/cm2) can have also been fabricated by solid state mat hod.

Type
Research Article
Copyright
Copyright © Materials Research Society 1990

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References

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