Fabrication of melt-textured Nd123 superconductors with Nd2BaO4 addition

Hu, Anming; Obradors, X.; Gomis, V.; Puig, T.; Carrillo, A.E.; Cardellach, E.; Mendoza, Ernest; Zhao, Zhongxian; Xiong, Ji

doi:10.1016/s0964-1807(98)00093-3

Cited by 17 publications

(15 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…We can see that the particle size of trapped Nd422 particles (dark color) ranges from 1 ∼ 9 μm and from 1 ∼ 15 μm for the samples with and without Nd242, respectively, indicating that the sizes of the Nd422 particles were reduced due to the addition of Nd242. A commensurate phenomenon of reduction in size of LRE211 was also reported for LRE123 bulks with the addition of Barich phases, e.g., LRE210 or LRE242 [18,[20][21][22][23]. Specifically, the particle size of Nd422 ranged from 1 ∼ 12 μm and from 6 ∼ 16 μm for the samples with and without Nd210, respectively [23].…”

Section: Resultssupporting

confidence: 63%

Effects on air-processed NdBCO superconductor bulks when adding a Ba-rich Nd₂Ba₄Cu₂O₉phase

Lei

Cheng

Peng

et al. 2014

Supercond. Sci. Technol.

View full text Add to dashboard Cite

Employing a novel Ba-rich Nd 2 Ba 4 Cu 2 O 9 (Nd242) phase in the precursor, air-processed NdBCO bulk superconductors were grown by using NdBCO film seeds. To obtain single-phase Nd242 powders, the sintering conditions were adjusted by varying the processing atmosphere and temperature. Furthermore, the influences of adding Nd242 on both the superconducting property and the crystal growth of the NdBCO bulk were investigated. We present experimental evidence suggesting that the addition of Nd242 can effectively improve the superconducting performance of NdBCO bulks, which showed optimal properties when the Ba:Cu ratio in the precursor was 0.80. We also found that the addition of Nd242 caused an increase in growth rate, particularly along the c-axis direction of the NdBCO. Moreover, the effect of the addition of Nd242 on the growth rate was clarified.

show abstract

Section: Resultssupporting

confidence: 63%

Effects on air-processed NdBCO superconductor bulks when adding a Ba-rich Nd₂Ba₄Cu₂O₉phase

Lei

Cheng

Peng

et al. 2014

Supercond. Sci. Technol.

View full text Add to dashboard Cite

show abstract

“…The oxygen‐controlled melt‐textured growth method, which uses low during the fabrication of an (LRE)BCO superconductor, was found to be the most effective way to improve the superconducting properties of an (LRE)BCO bulk by suppressing an LRE/Ba substitution 20 . Different methods, such as a high crystallization rate 21 and postannealing in Ar, 22 using Ba‐rich precursors, 23 etc., have been developed to suppress the extent of LRE/Ba substitution during melt processing of (LRE)BCO bulks in an air atmosphere. However, in contrast to Sm and Nd systems, the transition temperature of the Gd system bulk superconductors did not appear to decrease considerably when they were fabricated in air 24 .…”

Section: Study Of the Superconducting Properties Of Gdbco Singlementioning

confidence: 99%

Large Size and High Performance of a Gd–Ba–Cu–O Bulk Superconductor Grown Using New Approaches

Cheng

Yan

et al. 2011

Journal of the American Ceramic Society

View full text Add to dashboard Cite

In this study, we report new approaches for the fabrication of Gd-Ba-Cu-O (GdBCO) bulk with a large size and promising superconducting properties, applying the cold-seeding melttextured (MT) method. Firstly, NdBCO thin films were used as seeds because of their superheating properties and an additional mini pellet was inserted between the seed and the bulk precursor. This approach allows to reach a higher maximum processing temperature (T max ) and a wider window for single grain growth, leading to the growth of large-sized bulk, 56 mm in diameter. Secondly, the use of both air and pure oxygen atmosphere in the growth process of GdBCO bulks indicates that high oxygen partial pressure has little impact on superconducting properties, which, however, effectively facilitates the growth rate. Thus, an oxygen-rich MT process is promisingly suggested for producing large-sized GdBCO bulks with insignificant degradation of superconducting properties. Finally, a new Ba-rich precursor was applied by adding an Sm242 compound. It was deduced that the addition of a substantial amount of Sm242 may enhance the critical current density J c with an insignificant reduction of T c .

show abstract

“…On the basis of the phase diagram in figure 1, doping BaCuO 2−x shifts the nominal composition towards a Ba-rich direction. It has been proved that a Ba-rich composition dramatically narrows the range of RE-Ba substitution [5][6][7]. Moreover, it is worth noting that excess BaCuO 2−x leads to a decrease in T c .…”

Section: Suppression Of Re-ba Substitutionmentioning

confidence: 99%

“…In previous studies, RE 2 BaO 4 addition was chosen to suppress the RE-Ba substitution during the melt growth in air [5,6]. Indeed this induces a Ba-rich composition, which is similar to using Ba-rich Nd 4+2x Ba 2+2x Cu 3−x O 10−y in the synthesis of high-T c NdBa 2 Cu 3 O 7−δ in air [7].…”

Section: Introductionmentioning

confidence: 99%

Single-grain growth, microstructure and superconducting properties of (Sm, Eu)123 superconductors with BaCuO_2 xaddition

Sakai

Zhou

et al. 2002

Supercond. Sci. Technol.

View full text Add to dashboard Cite

High quality (Sm 0.5 , Eu 0.5 )Ba 2 Cu 3 O 7−δ single domains were grown in air with BaCuO 2−x addition. It was found that a RE-Ba substitution (RE: Sm and Eu) could be effectively suppressed by a small addition of BaCuO 2−x . The 94 K superconductivity with sharp transition was obtained in the composition range of 0.16 ∼ 0.33 BaCuO 2−x and (Sm 0.5 , Eu 0.5 )Ba 2 Cu 3 O 7−δ in a molar ratio. At 77 K, a surface field of 0.8 T was trapped in a single-domain pellet of 3.2 cm diameter. A further addition of BaCuO 2−x deteriorated the microstructure and degraded the superconducting performance.

show abstract

Fabrication of melt-textured Nd123 superconductors with Nd2BaO4 addition

Cited by 17 publications

References 30 publications

Effects on air-processed NdBCO superconductor bulks when adding a Ba-rich Nd₂Ba₄Cu₂O₉phase

Effects on air-processed NdBCO superconductor bulks when adding a Ba-rich Nd₂Ba₄Cu₂O₉phase

Large Size and High Performance of a Gd–Ba–Cu–O Bulk Superconductor Grown Using New Approaches

Single-grain growth, microstructure and superconducting properties of (Sm, Eu)123 superconductors with BaCuO_2 xaddition

Contact Info

Product

Resources

About

Fabrication of melt-textured Nd123 superconductors with Nd2BaO4 addition

Cited by 17 publications

References 30 publications

Effects on air-processed NdBCO superconductor bulks when adding a Ba-rich Nd2Ba4Cu2O9phase

Effects on air-processed NdBCO superconductor bulks when adding a Ba-rich Nd2Ba4Cu2O9phase

Large Size and High Performance of a Gd–Ba–Cu–O Bulk Superconductor Grown Using New Approaches

Single-grain growth, microstructure and superconducting properties of (Sm, Eu)123 superconductors with BaCuO2 xaddition

Contact Info

Product

Resources

About

Effects on air-processed NdBCO superconductor bulks when adding a Ba-rich Nd₂Ba₄Cu₂O₉phase

Effects on air-processed NdBCO superconductor bulks when adding a Ba-rich Nd₂Ba₄Cu₂O₉phase

Single-grain growth, microstructure and superconducting properties of (Sm, Eu)123 superconductors with BaCuO_2 xaddition