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Simultaneous Substitution of Y and Ba by Ca in YBCO

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Abstract:

A series of samples of Y1-xCaxBa2Cu3Oy (YCBCO) were synthesized with 0.05≤x≤0.3 and characterized by DC magnetization, X-ray diffraction (XRD), and Rietveld refinement. It was found that Ca replaces Y and Ba in YBa2Cu3Oy (YBCO) simultaneously, and the amount of Ca in the Y and Ba positions is estimated by the refinement，respectively. The experimental results showed that the structural changes had a close correlation with Tc. With careful analysis of the change of the Tc below and above x=0.2 and the changes of the bond lengths, such as Cu(2)-O(2) and Cu(2)-O(3), it is suggested that the Ca substitution for Y suppresses the Tc more strongly than that for Ba.

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Periodical:

Materials Science Forum (Volumes 546-549)

Pages:

2123-2126

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.546-549.2123

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Online since:

May 2007

Authors:

L. Zhang, Jing Yu, Han Zhang

Keywords:

Simultaneous Substitution, Structural Changes, Superconductivity, Y1-xCaxBa2Cu3Oy

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© 2007 Trans Tech Publications Ltd. All Rights Reserved

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