Bi-2212相への酸化物粒子添加効果 Effects of Addition of Oxide Particles on Formation and Superconducting Properties of the Bi-2212 Phase
Bi-2212/Ag tape samples with finely dispersed oxide(x-Al<SUB>2</SUB>O<SUB>3</SUB> or MgO) particles were prepared by the partial melt-solidification technique. The formation and superconducting properties of the tape samples have been studied in relation to microstructure. In case of a-Al<SUB>2</SUB>O<SUB>3</SUB> particles addition, as the oxide additive content increased, the Ic value at 77K and OT decreased remarkably because of reaction between a-Al<SUB>2</SUB>O<SUB>3</SUB> and 2212 phase. On the other hand, MgO particles were uniformly dispersed in the Bi-2212 matrix without any reaction between 2212 phase and MgO, so that Ic almost unchanged. Isothermal magnetic hysteresis loop of MgO added samples was larger than that of non-added samples. These results suggested that MgO particle addition was effective for improvement in the flux pinning properties of the Bi-2212 phase.
粉体および粉末冶金 43(2), 183-186, 1996-02-15
Japan Society of Powder and Powder Metallurgy