Improvement of the superconducting properties of an infiltrated YBCO bulk superconductor by a BaCeO3 addition

Abstract A novel preform compaction method based on one new type of divisible mould was employed for fabricating single-grain YBCO bulk superconductor, which can complete the preform demoulding process through opening of the mould, rather than pushing the preform out in the regular mould. Thus it has natural superiority on eliminating macro-cracks, which has been proved by the sample surface morphology and the trapped field characterization. In addition, the divisible mould pressed sample exhibits higher levitation force and trapped field properties than the regular mould pressed samples, verifying the potentials of the divisible mould on improving the bulk performance. The optical micrograph results prove the superiority of the divisible mould on eliminating tiny cracks on sample surface. The processing facility and sample reliability brought by the divisible mould should also be emphasized, because the crushing and re-pressing of preform when it presents visible cracks can be omitted and the failed samples with surface cracks will no longer appear. Consequently, the experimental efficiency and stability are both enhanced.

Download Full-text

Anisotropy in Knoop Hardness of MPMG-Processed YBCO Bulk Superconductor

Advances in Superconductivity IX ◽

10.1007/978-4-431-68473-2_19 ◽

1997 ◽

pp. 729-732 ◽

Cited By ~ 2

Author(s):

T. Okamura ◽

Y. Inoue ◽

N. Sakai ◽

S. Takebayashi ◽

M. Murakami ◽

...

Keyword(s):

Knoop Hardness ◽

Bulk Superconductor ◽

Ybco Bulk

Download Full-text

Degradation of the magnetic shielding effect of YBCO bulk superconductor exposed to repetitive temperature change

Physica C Superconductivity ◽

10.1016/s0921-4534(01)00388-4 ◽

2001 ◽

Vol 357-360 ◽

pp. 781-784 ◽

Cited By ~ 2

Author(s):

S. Torii ◽

R. Nakayama ◽

D. Ebihara

Keyword(s):

Temperature Change ◽

Shielding Effect ◽

Magnetic Shielding ◽

Bulk Superconductor ◽

Ybco Bulk

Download Full-text

YBCO Bulk Superconductors with Sm Addition

Materials Science Forum ◽

10.4028/www.scientific.net/msf.891.483 ◽

2017 ◽

Vol 891 ◽

pp. 483-488 ◽

Cited By ~ 2

Author(s):

Daniela Volochová ◽

Vitaliy Antal ◽

Jozef Kováč ◽

Pavel Diko

Keyword(s):

Critical Current Density ◽

Critical Current ◽

Current Density ◽

Superconducting Properties ◽

Ybco Bulk ◽

Pinning Centers ◽

Bulk Superconductors ◽

Powder Addition ◽

Current Densities ◽

Precursor Powders

The influence of Sm addition on the microstructure and superconducting properties of Y-Ba-Cu-O (YBCO) bulk superconductors has been studied. Precursor powders YBa2Cu3O7-δ (Y-123), Y2O3 and CeO2 were enriched with different amounts of SmBa2Cu3Oy (Sm-123) or Sm2O3 powders with the aim to increase critical current density, Jc,by introducing additional pinning centers. YBCO bulk superconductors with SmBa2Cu3Oy (Y123-Sm) or Sm2O3 (Y123-SmO) powder addition were prepared by the optimized top seeded melt growth process in the form of single grains. Microstructure analysis revealed that Sm2O3 addition leads to a higher amount of smaller Y2BaCuO5 (Y-211) particles, what is related to high critical current densities (Jc ~ 7 x 104 A/cm2) of the YBCO samples with Sm2O3 addition in low magnetic fields. The effect of Sm addition in the form of SmBa2Cu3Oy as well as Sm2O3 powder on Y2BaCuO5 particle size, critical temperature, Tc, and critical current density, Jc, is reported.

Download Full-text