Superconducting yttriumhyphen;bariumhyphen;copperhyphen;oxide ribbons fabricated from a metal alloy precursor

摘要

We report a new process for making superconducting Yhyphen;Bahyphen;Cuhyphen;oxide ribbon from a ductile metal alloy precursor ribbon. We begin by melthyphen;spinnng an alloy having the composition YCu3to obtain the microcrystalline precursor ribbon. The ribbon is coated with a molten mixture of Ba inorganic compounds at 550thinsp;deg;C, and reacted in air at 925thinsp;deg;C to form the superconducting YBa2Cu3O7minus;xphase. The superconducting onset occurs at 92 K and zero resistance is reached at 89 K. Xhyphen;ray diffraction, electron microscopy, and magnetization measurements confirm that the ribbon is predominantly superconducting YBa2Cu3O7minus;x.