Abstract
The PrBa 2− x Sr x Cu 3O 7± 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 PrBa 2− x Sr x Cu 3O 7± δ solid solution is 0.2≤ x≤0.6. The structure of PrBa 2− x Sr x Cu 3O 7± δ is orthorhombic for x=0.2. The structure transforms into tetragonal for 0.3≤ x≤0.6. In the PrBa 2− x Sr x Cu 3O 7± 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 PrBa 2− x Sr x Cu 3O 7± 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 PrBa 2− x Sr x Cu 3O 7± δ system.
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