Preparation and Properties of Large Bulk YBCO Superconductor Quench and Melt Growth (QMG) Process

1991 ◽  
pp. 715-719 ◽  
Author(s):  
Kiyoshi Sawano ◽  
Mitsuru Morita ◽  
Masamoto Tanaka ◽  
Keiichi Kimura ◽  
Seiki Takebayashi ◽  
...  
Keyword(s):  
Ybco Superconductor ◽  
Melt Growth ◽  
Bulk Ybco ◽  
Large Bulk

Long‐time magnetic relaxation measurements on a quench melt growth YBCO superconductor

1994 ◽  
Vol 76 (10) ◽  
pp. 6950-6952 ◽  
Author(s):  
L. H. Bennett ◽  
L. J. Swartzendruber ◽  
M. J. Turchinskaya ◽  
J. E. Blendell ◽  
J. M. Habib ◽  
...  
Keyword(s):  
Magnetic Relaxation ◽  
Ybco Superconductor ◽  
Melt Growth ◽  
Relaxation Measurements ◽  
Long Time

scholarly journals Two‐beam photoacoustic phase measurement of the thermal diffusivity of a Gd‐doped bulk YBCO superconductor

1996 ◽  
Vol 67 (4) ◽  
pp. 1564-1569 ◽  
Author(s):  
M. Aravind ◽  
P. C. W. Fung ◽  
S. Y. Tang ◽  
H. L. Tam
Keyword(s):  
Thermal Diffusivity ◽  
Phase Measurement ◽  
Ybco Superconductor ◽  
Bulk Ybco

Optimization of Y2BaCuO5 phase morphology for the growth of large bulk YBCO grains

1995 ◽  
Vol 10 (9) ◽  
pp. 2241-2250 ◽  
Author(s):  
F. Frangi ◽  
T. Higuchi ◽  
M. Deguchi ◽  
M. Murakami
Keyword(s):  
Magnetic Levitation ◽  
Thermal Treatments ◽  
Bulk Ybco ◽  
Large Bulk ◽  
Different Types ◽  
Current Densities ◽  
Grain Growth Kinetics ◽  
Precursor Powders ◽  
Magnetic Levitation Force ◽  
Very High

YBCO samples were prepared using different types of precursor powders: quenched, or YBa2Cu3O7−x and Y2BaCuO5 commercial powders, with and without Pt addition. Two stoichiomctrics, corresponding to 0 and 40% molar excess of the Y2BaCuO5 phase, were adopted. The behavior of the Y2BaCuO5 phase through thermal treatments, typical of melt processes, was observed by quenching the samples at various stages. YBa2Cu3O7−x grain growth kinetics was enhanced and liquid phase losses were limited by optimizing the morphology of the Y2BaCuO5 phase in the partially melted state, with the simultaneous presence of round particles ≤1 μm and needle-like particles with very high aspect ratio. The optimized processing conditions were adopted, together with a seeding technique, to grow YBCO samples. At 77 K, a magnetic levitation force of 2.5 kg was measured for a sample with 18 mm diameter, and magnetization critical current densities over 104 A/cm2 were reached at 1 T.

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