Japanese Journal of Applied Physics · 1988 · 267 citations · 2 references
Natural SciencesMaterials SciencePhysicsCondensed Matter PhysicsCrystal StructureSolid State PhysicsInorganic MaterialsPhase TransitionsSemiconducting MaterialsStrongly Correlated Electron SystemsSuperconducting MaterialsCritical TemperatureCuprate SuperconductorsHigh-temperature SuperconductivityHigh-temperature SuperconductorsSuperconducting CeramicsSuperconducting Critical TemperatureSuperconducting Phase Transitions
A pure 110 K phase of the Bi-Pb-Sr-Ca-Cu-O superconductor was obtained by co-decomposition of metal nitrates and a solid reaction under low oxygen pressure. The best starting compositions were in the region close to Bi 1.84 Pb 0.34 Sr 2 Ca 2 Cu 3 O y with a little excess of Ca and Cu. In this region, the samples showed the absence of the 80 K and semiconducting phase, and there was no indication of impurities at all. The 110 K phase without stacking faults is stabilized by the addition of Pb, so that the nominal composition close to the ideal one is required at the start. A little excess of Ca and Cu, however, effectively decreases the 80 K phase.
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