Effect of Pt Addition on Melt-Processed YBaCuO Superconductors

Abstract

Platinum addition in precursors of melt processing could produce finely dispersed Y 2 BaCuO 5 (211) inclusions of about 1 µm in YBa 2 Cu 3 O x matrix. This fine dispersion of 211 resembles that of quench-and-melt-grown materials. The platinum-added sample exhibited a critical current density exceeding 2×10 4 A/cm 2 at 77 K and 1 T. Platinum is considered to enhance the nucleation of 211 which forms by the pertitectic reaction between Y 2 O 3 and liquid phase.