Microstructure and Superconductivity in Bi–Sr–Ca–Cu–O System Doped with Pb and Sb

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Abstract
A series of samples Bi x Pb y Sb0.1Sr2Ca2Cu z O w has been produced by two methods. X-ray diffraction patterns revealed that there was a nearly single 2223 phase with a small amount of monoclinic phase in both two kinds of samples. The samples made by the oxalate coprecipitation technique had T CO=102 K. The A.C. magnetic susceptibility showed only one sharp transition at 110 K. For samples prepared by a mixture of powders, the electrical resistance began to drop at 140 K, reaching zero at 92 K. Their A.C. magnetic susceptibility showed sharp transition at 135 K, and no transition at 110 K. The monoclinic particles were segregated on the surface of the samples. The intergrowth of 2223 and monoclinic phases at their boundaries caused the partial distortion of the 2223 phase. The distorted 2223 phase might be responsible for the 130 K superconductivity.

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