Synthesis and Superconductivity of Y₂Ba₁Cu₁O_(5) and Pt Added Nd₁Ba₂Cu₃O_(7-y) Bulk Superconductor

다국어 초록 (Multilingual Abstract)

Nd₁Ba₂Cu₃O_(7-y) (Nd123) bulk superconductor with T_(c) > 77 K was prepared by a melt process under 1 atm pure oxygen and reduced oxygen partial pressures. The addition of Y₂Ba₁Cu₁O_(5) (Y211) particles suppressed the generation of microcracks during oxygenation in resulting in the dispersion of Y211 fine particles. The addition of a small amount of Pt resulted in the reduction of the size of Y211 particles. The oxygen partial pressure (Po₂) of 0.01 atm was the optimum atmosphere for the synthesis of Nd123 in which Y211 particles were dispersed finely and homogeneously. The addition of Y211 and Pt enhanced the flux pinning force in a melt-processed Nd123 specimen because the presence of Y atoms in a melt phase suppressed, to some extent, the substitution of Nd on Ba site in an Nd123 crystal prepared by a melt process.

목차 (Table of Contents)

• 1. INTRODUCTION
• 2. EXPERIMENTAL PROCEDURE
• 3. RESULTS AND DISCUSSION
• 4. CONCLUSIONS
• ACKNOWLEDGMENT
• REFERENCES