Progress in melt texturing of YBa2Cu3Oxsuperconductor

Saláma, K.; Lee, D F

doi:10.1088/0953-2048/7/4/002

Cited by 155 publications

(73 citation statements)

References 74 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In the literature the use of precursor mixtures Y2O3/BaCuO2/CuO or Y2BaCuO5/BaCuO2/CuO has been mostly reported for preparation of textured YBa2Cu3O7_δ material by the PMP technique [1,2]. However, according to [9] the system Y2Cu2O5/BaCuO2 leads in the temperature range of 1025-1075°C to a coexistence region of Y2BaCuO5 -+ CuO -F L, which should be suitable for growing the textured YBa2 Cu3O7-δ material.…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Magnetic Properties of YBa₂Cu₃O_7-δMelt Textured Samples Prepared by Powder Melting Process and Quench and Melt Growth Techniques

et al. 2000

View full text Add to dashboard Cite

The microstructure and magnetic properties of the melt textured YBa2Cu3O7_δ samples prepared by the powder melting process, in which Y2Cu2O5 and BaCuO2 were used as precursors, and those prepared by the quench aud melt growth method are described and compared. The lattice parameters and Tc values for the samples prepared by the both techniques were similar. The penetration and the spatial distribution of the magnetic flux in the superconducting samples was imaged by means of a field-mapping device using a Hall probe. In the range of low magnetic fields up to 820 A m-1 no significant differences in penetration of magnetic flux between the samples prepared by the powder melting process and the quench and melt growth were observed. The mapping could not resolve any grain boundaries, single grains and structural defects. By the ac and virgin volume magnetisation characteristics, which were measured in the zero-field cooled condition by a 2nd order SQUID gradiometer, no weak links were identified. Better magnetic properties of the quench and melt growth samples in high magnetic fields can be explained by the differences in microstructure and/or by the risen content of the finely dispersed 211 and Pt containing phases. The increase factor in magnetisation is about 2.5. Some aspects of the Bean model for textured YBa2Cu3O7-δ samples are discussed.

show abstract

Section: Resultsmentioning

confidence: 99%

“…They differ in the precursors, which serve as a source of the system Y2BaCuO5+L (3BaCuO2+2CuO), from which the textured YBa2Cu3O7_δ grows. The choice of the precursors strongly influences the mechanism of growth and the microstructure of the obtained products and consequently their electric and magnetic properties [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

Magnetic Properties of YBa₂Cu₃O_7-δMelt Textured Samples Prepared by Powder Melting Process and Quench and Melt Growth Techniques

et al. 2000

View full text Add to dashboard Cite

show abstract

“…It can be seen that the Y211 particles (light gray color) are near uniformly distributed in the YBCO matrix of all the samples, but there was no obvious difference in the size and density of Y211 particles as the ZnO addition increased. It is known that Y211 particles can provide effective pinning centers, [25][26][27] but the flux pinning force provided by the Y211 particles is nearly the same for all samples based on the …”

Section: The Effects Of Zno Additions On Microstructure Of Ybco Bulksmentioning

confidence: 99%

Influence of ZnO doping on the properties of single domain YBCO bulks fabricated by RE+011 TSIG process

Yang

Yuan

Guo

2017

Int. J. Mod. Phys. B

View full text Add to dashboard Cite

Single domain YBCO bulk superconductors with different additions of ZnO have been successfully fabricated by RE+011 TSIG process with a new solid phase of [(100 − x)(Y 2 O 3 +1.2BaCuO 2 )+xZnO] and a new liquid phase of (Y 2 O 3 +6CuO+10BaCuO 2 ). The effects of ZnO additions on the growth morphology, microstructure, critical temperature (Tc), the levitation force and trapped field of the YBCO bulks have been investigated. It is found that within the range of ZnO additions x = 0-1.0 wt.%, all the samples are of the typical characteristic of single-domain YBCO bulk; the Tc of the samples decreases from 92 K to 80 K when the ZnO addition x increases from x = 0 wt.% to x = 1.0 wt.%; the levitation force and trapped field of the samples firstly increase and then decrease with increase of ZnO additions after going through a maximum, which is closely related with the ZnO addition and the resulting flux pinning force caused by lattice distortion due to the substitution of Zn 2+ for Cu 2+ site in the YBCO crystal; the largest levitation force 36.8 N (77 K, 0.5 T) and trapped field 0.416 T (77 K, 0.5 T) of the samples are obtained when x = 0.1 wt.%, respectively. This result is significantly important and helpful for us to improve the properties of YBCO bulk superconductors.

show abstract

“…It is considered that the presence of dispersed inclusions of the Y211 phase in the superconductive structure improves the pinning due to the formation of high density of dislocations and stacking faults around Y211 grains [18].…”

Section: Nanostructural Superconducting Materials For Fault Currentmentioning

confidence: 99%

Nanostructural Superconducting Materials for Fault Current Limiters and Cryogenic Electrical Machines

et al. 2010

View full text Add to dashboard Cite

Materials of the Y-Ba-Cu-O (melt-textured YBa2Cu3O 7−δ -based materials or MT-YBCO) and Mg-B-O (MgB2-based materials) systems with high superconducting performance, which can be attained due to the formation of regularly distributed nanostructural defects and inhomogeneities in their structure can be effectively used in cryogenic technique, in particular in fault current limiters and electrical machines (electromotors, generators, pumps for liquid gases, etc.). The developed processes of high-temperature (900-800• C) oxygenation under elevated pressure (16 MPa) of MT-YBCO and high-pressure (2 GPa) synthesis of MgB2-based materials allowed us to attain high superconductive (critical current densities, upper critical fields, fields of irreversibility, trapped magnetic fields) and mechanical (hardness, fracture toughness, Young modulus) characteristics. It has been shown that the effect of materials properties improvement in the case of MT-YBCO was attained due to the formation of high twin density (20-22 µm −1 ), prevention of macrocracking and reduction (by a factor of 4.5) of microcrack density, and in the case of MgB2-based materials due to the formation of oxygen-enriched as compared to the matrix phase fine-dispersed Mg-B-O inhomogeneities as well as inclusions of higher borides with near-MgB12 stoichiometry in the Mg-B-O matrix (with 15-37 nm average grain sizes). The possibility is shown to obtain the rather high Tc (37 K) and critical current densities in materials with MgB12 matrix (with 95% of shielding fraction as calculated from the resistant curve).

show abstract

Progress in melt texturing of YBa₂Cu₃O_xsuperconductor

Cited by 155 publications

References 74 publications

Magnetic Properties of YBa₂Cu₃O_7-δMelt Textured Samples Prepared by Powder Melting Process and Quench and Melt Growth Techniques

Magnetic Properties of YBa₂Cu₃O_7-δMelt Textured Samples Prepared by Powder Melting Process and Quench and Melt Growth Techniques

Influence of ZnO doping on the properties of single domain YBCO bulks fabricated by RE+011 TSIG process

Nanostructural Superconducting Materials for Fault Current Limiters and Cryogenic Electrical Machines

Contact Info

Product

Resources

About

Progress in melt texturing of YBa2Cu3Oxsuperconductor

Cited by 155 publications

References 74 publications

Magnetic Properties of YBa2Cu3O7-δMelt Textured Samples Prepared by Powder Melting Process and Quench and Melt Growth Techniques

Magnetic Properties of YBa2Cu3O7-δMelt Textured Samples Prepared by Powder Melting Process and Quench and Melt Growth Techniques

Influence of ZnO doping on the properties of single domain YBCO bulks fabricated by RE+011 TSIG process

Nanostructural Superconducting Materials for Fault Current Limiters and Cryogenic Electrical Machines

Contact Info

Product

Resources

About

Progress in melt texturing of YBa₂Cu₃O_xsuperconductor

Magnetic Properties of YBa₂Cu₃O_7-δMelt Textured Samples Prepared by Powder Melting Process and Quench and Melt Growth Techniques

Magnetic Properties of YBa₂Cu₃O_7-δMelt Textured Samples Prepared by Powder Melting Process and Quench and Melt Growth Techniques