The La2-xPrxCayBa2Cu4+yOz (LaPrCaBCO) mixed oxides have been studied for their structural and superconducting properties using X-ray diffraction (XRD), d.c. resistivity, d.c. susceptibility and iodometric double titration techniques. The Rietveld analysis of the XRD data of all the LaPrCaBCO samples (x = 0.1-0.5) exhibits that all the compounds crystallize in tetragonal R-123 type structure (space group P4/mmm). With the increase in x, T-c increases up to a maximum value of 58 K (x = 0.5, La-2125 stoichiometry), which is interesting for Pr substituted high T-c oxides. The results of structural studies and superconducting property measurements are presented in light of increase in T-c in LaPrCaBCO system with increasing Pr concentration. (C) 2003 Elsevier Ltd. All rights reserved. References: 13
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