Abstract
We have studied difference in electrical transport properties of polycrystalline PrBa 2Cu 3O 7 (Pr123) by changes in synthesis conditions. As raw material we used the carbon free 3N-BaO 2 and the tetravalent Pr free 3N-Pr 2O 3. These raw materials are mixed with CuO and reacted in Ar atmosphere with low oxygen concentration. The temperature dependence of resistivity shows almost semiconductive behavior for all the samples. However, when the samples were prefired in Ar atmosphere with 0.2–0.4% oxygen concentration, the absolute value of resistivity at room temperature decreased to the value close to that of YBa 2Cu 3O 7 superconductor. From these results we think that the control of site occupation of Pr atoms is important to give the low resistive Pr123.
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