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Subsolidus phase relation and crystal structure of the PrBa2−xSrxCu3O7±δ system |
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| Authors: | GB Song JK Liang LT Yang QL Liu GY Liu HF Yang GH Rao |
| Affiliation: | a Institute of Physics and Center for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100080, PR China b School of Material Science and Engineering, Southwest University of Science and Technology, Mianyang 621002, PR China c International Center for Materials Physics, Chinese Academy of Sciences, Shenyang 110016, PR China |
| Abstract: | The PrBa2?xSrxCu3O7±δ solid solution was investigated by means of X-ray powder diffraction in combination with Rietveld analysis. The Sr-doped Pr123 single phase could be synthesized at 950 °C in air. The solubility of PrBa2?xSrxCu3O7±δ solid solution is 0.2≤x≤0.6. The structure of PrBa2?xSrxCu3O7±δ is orthorhombic for x=0.2. The structure transforms into tetragonal for 0.3≤x≤0.6. In the PrBa2?xSrxCu3O7±δ structure, Sr ions can replace Ba ions, the highest value is x=0.6 under our experimental condition. But Sr ions could not replace Pr ions. Furthermore Pr ions could not occupy the sites of Ba ions in the PrBa2?xSrxCu3O7±δ system. Both ionic radii and chemical properties play an important role in the mutual substitution of Pr, Ba and Sr ions in the Pr123 structure of the PrBa2?xSrxCu3O7±δ system. |
| Keywords: | Author Keywords: Pr123 Solid solution Ionic radius Chemical property Substitution |
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