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Subsolidus phase relation and crystal structure in the Pr1+x-yBa2-x-zCay+zCu3O7±δ system

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Abstract

The Pr1+xBa2-xCu3O7±δ solid solution was investigated by means of X-ray powder diffraction combined with Rietveld analysis. A Pr123 single phase could be synthesized under Pr-rich conditions by sintering at 950 °C in air. The solubility range of Pr1+xBa2-xCu3O7±δ solid solution is 0.08≤x≤0.80. The structure of Pr1+xBa2-xCu3O7±δ for 0.08≤x<0.30 is orthorhombic. The structure transforms into tetragonal for 0.30≤x≤0.80. To form the Pr123 single phase, the Ba sites in the Pr123 structure must have partial Pr ions, and the least amount is x=0.08. Ba ions cannot occupy the sites of Pr ions. In the Pr123 structure, Ca ions can replace Pr ions; the highest value is x=0.4 in the PrBa2-xCaxCu3O7±δ system under our experimental conditions. However, Ca ions cannot replace Ba ions. The ionic radius plays a more important role than the chemical properties in the substitution between Pr, Ba and Ca ions in the Pr123 structure.

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Authors and Affiliations

  1. Institute of Physics and Center for Condensed Matter Physics, Chinese Academy of Sciences, 100080, Beijing, China

    G.B. Song , J.K. Liang , L.T. Yang , J.R. Chen , G.Y. Liu , H.F. Yang  & G.H. Rao

  2. Institute of Mineral Materials and Application, Southwest University of Science and Technology, 621002, Mianyang, China

    G.B. Song

  3. International Center for Materials Physics, Chinese Academy of Sciences, 110016, Shenyang, China

    J.K. Liang

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PACS

61.50.Ah; 64.70.Kb; 61.72.Ff

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Song , G., Liang , J., Yang , L. et al. Subsolidus phase relation and crystal structure in the Pr1+x-yBa2-x-zCay+zCu3O7±δ system. Appl Phys A 77, 915–921 (2003). https://doi.org/10.1007/s00339-002-2071-7

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