Superconducting device and superconducting cable with high sintering density

摘要

A superconducting device having an oxide superconducting wire is disclosed. The oxide superconducting wire has an oxide superconductor and a sheath portion which covers the oxide superconductor, and is made of one of silver and a silver alloy. The oxide superconductor is a Bi-Pb-Sr-Ca-Cu-O based oxide superconductor containing bismuth, lead, strontium, calcium, and copper, and includes a Bi2223 phase having atomic ratios of (bismuth and lead) : strontium : calcium : copper expressed as 2 : 2 : 2 : 3 in approximation. The oxide superconductor exhibits a sintering density of at least 93%.