Abstract
Sr2CaMO6 (M = Mo, W) and SrAO3 (A = Zr, Hf) phases which are chemically compatible with Bi2212 were investigated as pinning additives. The superconducting materials were obtained by the partialmelt-crystallization method. It was found that, at low temperatures, the critical-current densities Jc in the composites did not significantly differ from those in the reference samples. The exception was the W-containing composite, which showed an increased width of the hysteresis loop. At elevated temperatures, the pinning characteristics for most of the composites were better than for the reference samples. The pinning parameters at high temperatures were enhanced when the content of nonsuperconducting particles was significantly increased providing that the superconductor-matrix properties were not changed during the modification.
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