レーザー溶融ベルヌーイ法によるBi-2201結晶の作成とその評価

概要

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Bi superconductor systems are composed from Bi : Sr : Ca : Cu=2 : 2 : 2 : 3,2 : 2 : 1 : 2 and 2 : 2 : 0 : 1. For the purpose of preparing pure Bi-2201 crystals of Bi : Sr : Ca : Cu=2 : 2 : 0 : 1,the laser Verneuil cruciblefree method is employed. Generally, as-grown Bi-2201 crystals show no superconductivity. The property of prepared Bi-2201 crystals before thermal annealing are compared with those after thermal annealing by using Nomarski-type interference contrast microscope observation, XRD analysis and the temperature dependence of electrical resistance (R-T characteristics). By the experimental results, it is found that the crystal morphology, lattice constant and R-T characteristics are changed greatly by preparation condition and annealing condition.
東海大学の論文