Japanese Journal of Applied Physics · 1989 · 59 citations · 8 references
Natural SciencesMaterials SciencePhysicsCondensed Matter PhysicsSolid State PhysicsSolid-state ChemistryAlloysElectrical Properties Of CeramicsInorganic MaterialsPhase DiagramsPhase TransitionsSuperconducting MaterialsCalcinationCuprate SuperconductorsElectrical ResistivityElectrical Resistivity AnalysisHigh-temperature SuperconductivityHigh-temperature SuperconductorsSuperconducting CeramicsX-ray Diffraction Analysis
The phase diagram in the superconducting Bi 1.68 Pb v Sr x Ca v Cu z O w ( v =0.28, 0.32) system was investigated by means of X-ray diffraction and electrical resistivity for samples calcined in air. The results revealed that the phase was classified into four regions, a single 110 K-phase region, two types of two-phase regions (110 K phase+Ca 2 CuO 3 and 110 K phase+80 K phase) and a three-phase region (110 K phase+Ca 2 CuO 3 +80 K phase). The single 110 K phase with a T c of about 106–108 K exists in a fairly wide composition range, especially in the Bi 1.68 Pb 0.32 Sr 1.75 Ca y Cu z O w system, 1.75≦ y ≦1.85 and 2.65≦ z ≦2.85. This means that the single 110 K phase can be easily obtained, even by the usual calcination in air in the Bi-Pb-Sr-Ca-Cu-O system.
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Sputter Deposition of BiSrCaCuO Thin Films
Masao Fukutomi, Junichi Machida, Yoshiaki Tanaka et al. · Japanese Journal of Applied Physics · 1988 · 692 citations