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Subsolidus phase relations and crystal structures in the Pr1+xBa2−xCu3O7±δ system at 950 °C

Published online by Cambridge University Press:  05 March 2012

G. B. Song ,
J. K. Liang ,
F. S. Liu ,
L. T. Yang ,
J. Luo  and
G. H. Rao
G. B. Song*
Affiliation:
School of Material Sciences and Engineering, Southwest University of Science and Technology, Mianyang, 621002, Chinaand Institute of Physics and Center for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100080, China
J. K. Liang
Affiliation:
Institute of Physics and Center for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100080, Chinaand International Center for Materials Physics, Chinese Academy of Sciences, Shenyang 110016, China
F. S. Liu
Affiliation:
School of Material Sciences and Engineering, Southwest University of Science and Technology, Mianyang, 621002, Chinaand Institute of Physics and Center for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100080, China
L. T. Yang
Affiliation:
Institute of Physics and Center for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100080, China
J. Luo
Affiliation:
Institute of Physics and Center for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100080, China
G. H. Rao
Affiliation:
Institute of Physics and Center for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100080, China
*
a)Electronic mail: [email protected]
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Abstract

Pr1+xBa2−xCu3O7±δ solid solution was investigated by means of X-ray powder diffraction and Rietveld analysis. Single-phase PrBa2Cu3O7±δ (Pr123) can be synthesized under a Pr-rich condition by sintering at 950 °C in air. The solubility of Pr1+xBa2−xCu3O7±δ solid solution is 0.08≤x≤0.80. The structure of Pr1+xBa2−xCu3O7±δ is orthorhombic for 0.08≤x<0.30, and transforms into tetragonal for 0.30≤x≤0.80. To form single-phase Pr123, the Ba sites in the Pr123 structure are partially occupied by excess Pr ions, and the smallest amount of excess Pr is x=0.08. Meanwhile, all Ba ions stay in the Ba sites.

Keywords

Pr123solid solutionionic radiuschemical propertysubstitution
Type
Selected Papers from 2003 Chinese National Symposium on XRD
Information
Powder Diffraction , Volume 19 , Issue 4 , December 2004 , pp. 320 - 324
Copyright
Copyright © Cambridge University Press 2004

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