Japanese Journal of Applied Physics · 1987 · 65 citations · 14 references
Natural SciencesMaterials EngineeringMaterials ScienceCondensed Matter PhysicsSolid State PhysicsThermal AnalysisHigh-temperature MaterialsSuperconducting MaterialsThermal Properties Of CeramicsThermogravimetric AnalysisCuprate SuperconductorsHigh-temperature SuperconductivityHigh-temperature SuperconductorsOrthorhombic Unit CellsSlow CoolingSuperconducting CeramicsSuperconducting Critical TemperatureSuperconducting Properties
In situ observation of oxygen absorption and desorption during heating and cooling cycle with TG and DTA was done to determine the optimum preparation conditions of high T c Y-Ba-Cu-O compounds. We suggest the best recipe in air is to fire the raw mixture of 1/2Y 2 O 3 , 2BaCO 3 and 3CuO at 930°C for more than 10 h, followed by slow cooling in the furnace to take as much oxygen as possible within the specimen. With this method single phase material of an orthorhombic superconducting oxide YBa 2 Cu 3 O 6.74 with T c =91.3 K was synthesized, with orthorhombic unit cell dimensions of a =3.8180(6) Å, b =3.8888(7) Å, and c =11.668(2) Å.
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Evidence for superconductivity above 40 K in the La-Ba-Cu-O compound system
C. W. Chu, P. H. Hor, R. L. Meng et al. · Physical Review Letters · 1987 · 1.5K citations · Full text
High T<sub>c</sub>Superconductivity of La-Ba-Cu Oxides
Shin‐ichi Uchida, H. Takagi, K. Kitazawa et al. · Japanese Journal of Applied Physics · 1987 · 490 citations