Peritectic melting of thin films, superheating and applications in growth of REBCO superconductors

Chen, Yuanyuan; Cui, Xiaoxiao; Yao, Xin

doi:10.1016/j.pmatsci.2014.09.001

Cited by 36 publications

(24 citation statements)

References 149 publications

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“…Finally, the precursor powders were pressed into bulks with the size of 20 mm in diameter and 10 mm in thickness. And then the c-axis-oriented Y123-buffered NdBCO thin film seed (shortly, the NdBCO film seed) was placed at the center on the upper surface of the bulk to induce crystal growth (a unique film-seeding technique developed in our laboratory 16,17 ).…”

Section: Methodsmentioning

confidence: 99%

YBa₂Cu₃O_7‐δ superconductor bulks composited by Y₂BaCuO₅ nanoparticles derived from homogeneous nucleation catastrophe

Liu

Pan

et al. 2017

J Am Ceram Soc

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The refinement of Y2BaCuO5 (Y211) particles is a matter of significant importance in fabricating high‐performance YBa2Cu3O7‐δ (Y123) superconductor bulks by top‐seeded melt growth (TSMG). However, coarsening and epitaxial growth naturally occur to the preexisting Y211 grains in the conventional process, causing an unwanted size enlargement. Here, for the first time, we report a novel TSMG approach in which instead of Y211, modified precursor powders (MPP, Y2O3, and Ba2Cu3Ox) were employed. As a result, massive numbers of Y211 nanoparticles were derived from the homogeneous nucleation catastrophe through peritectic solidification of Y2O3+Bax‐Cuy‐O→Y211. Correspondingly, superior property of trapped field was achieved from the MPP‐processed bulk.

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Section: Methodsmentioning

confidence: 99%

YBa₂Cu₃O_7‐δ superconductor bulks composited by Y₂BaCuO₅ nanoparticles derived from homogeneous nucleation catastrophe

Liu

Pan

et al. 2017

J Am Ceram Soc

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“…However, improvements to the thermal stability of the film seed are still required to broaden the growth window. It is generally believed that the thermal stability of the film seeds is mainly attributable to low film/substrate interface energy and the RE solubility in liquid phase. In changing the interface energy, Chen et al.…”

Section: Introductionmentioning

confidence: 99%

Pellet‐buffered film seed to grow single grain bulk YBCO

et al. 2017

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Epitaxial thin film seeds, exhibit a higher peritectic temperature than the bulk, have been recognized as a possible way to obtain large-sized single-grain REBCO bulks. Recently, use of a pellet as a buffer layer inserted between the film-seed and the main pellet has been reported. This approach can prevent Mg diffusion from the MgO substrate to the film seed, and enable the thin film to tolerate a higher maximum temperature in the TSMG (Top Seed Melt Growth) method.However, we found that the liquid phase decomposed from YBa 2-Cu 3 O 7Àx (YBCO) contacted the MgO substrate, due to surface tension, and caused undesirable grain nucleation. To resolve this problem, this study used a mini-pellet, smaller than the seed, as a buffer layer. This new technique can avoid the liquid phase contacting the MgO substrate, thereby allowing the YBCO single-grain bulk to be grown more easily. Moreover, the thin film seed can be re-used by removing the buffer layer after the crystal growing process.

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“…The scientists explore this fascinating phenomenon in various structures, which opened up new horizons on this field . Nowadays, deep investigation on the superheating mechanism, searching novel structures possessing the high superheating capability, and realizing its practical application attract great attention in the scientific world . In recent years, experimental evidences have clearly proved that the c ‐axis oriented RE123 (REBa 2 Cu 3 O y , RE = Nd, Sm and Y) films on the MgO substrate (shortly, RE123/MgO), as a quasi‐2D structure possesses a superheating capacity, i.e., the RE123 film may remain in its metastable solid phase above its peritectic melting temperature over several tens degrees .…”

Section: Introductionmentioning

confidence: 99%

Melting behavior and superheating capacity of REBa₂Cu₃O_y films with nano‐layer buffered structures

et al. 2017

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Using high temperature-optical microscopy, in situ investigations were conducted on melting and superheating behaviors of REBa 2 Cu 3 O 7Àd (RE123, RE = Nd, Gd) films, which were grown on nano-layer buffered substrates. The results demonstrate that all buffered RE123 films have improved crystallinity and in-plane alignments, leading to the higher superheating capability. In the first case, due to its good lattice match with the buffer material of Y123, the Nd123 film with the minimal extrinsic property grew from the superior interface. In the second circumstance, because of its stronger chemical bonding with the buffer layer of Gd 2 O 3 , the pure c-axis oriented Gd123 film was fabricated. Moreover, the optimized thickness of buffer layer plays an important role in reducing interface energy of RE123 films and enhancing its superheating capacity. K E Y W O R D S multilayers, thermal decomposition, thin films

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Peritectic melting of thin films, superheating and applications in growth of REBCO superconductors

Cited by 36 publications

References 149 publications

YBa₂Cu₃O_7‐δ superconductor bulks composited by Y₂BaCuO₅ nanoparticles derived from homogeneous nucleation catastrophe

YBa₂Cu₃O_7‐δ superconductor bulks composited by Y₂BaCuO₅ nanoparticles derived from homogeneous nucleation catastrophe

Pellet‐buffered film seed to grow single grain bulk YBCO

Melting behavior and superheating capacity of REBa₂Cu₃O_y films with nano‐layer buffered structures

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Peritectic melting of thin films, superheating and applications in growth of REBCO superconductors

Cited by 36 publications

References 149 publications

YBa2Cu3O7‐δ superconductor bulks composited by Y2BaCuO5 nanoparticles derived from homogeneous nucleation catastrophe

YBa2Cu3O7‐δ superconductor bulks composited by Y2BaCuO5 nanoparticles derived from homogeneous nucleation catastrophe

Pellet‐buffered film seed to grow single grain bulk YBCO

Melting behavior and superheating capacity of REBa2Cu3Oy films with nano‐layer buffered structures

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Product

Resources

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YBa₂Cu₃O_7‐δ superconductor bulks composited by Y₂BaCuO₅ nanoparticles derived from homogeneous nucleation catastrophe

YBa₂Cu₃O_7‐δ superconductor bulks composited by Y₂BaCuO₅ nanoparticles derived from homogeneous nucleation catastrophe

Melting behavior and superheating capacity of REBa₂Cu₃O_y films with nano‐layer buffered structures