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Recycling failed bulk YBCO superconductors using the NdBCO/YBCO/MgO film-seeded top-seeded melt growth method
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10.1063/1.4720400
/content/aip/journal/jap/111/10/10.1063/1.4720400
http://aip.metastore.ingenta.com/content/aip/journal/jap/111/10/10.1063/1.4720400

Figures

Image of FIG. 1.
FIG. 1.

(a) A failed YBCO bulk grown from homemade powders. (b) The corresponding recycled bulk processed at Tmax of 1105 °C with a NdBCO/YBCO/MgO film seed.

Image of FIG. 2.
FIG. 2.

(a) A recycled bulk using a Tmax of 1115 °C. (b) A schematic of different positions within the recycled single domain from which specimens were cut. (c) The normalized magnetization of the specimens as a function of the temperature in an external field of 20 Oe.

Image of FIG. 3.
FIG. 3.

(a) Heating profiles corresponding to the three different types of failed REBCO bulks. Schematic cross-sections for the three kinds of failed bulks are attached to their corresponding heating profiles. TE: the equilibrium temperature; TMeta: the critical temperature between metastable and unstable statuses. The inset in (a) is a schematic illustration showing a typical heating profile of REBCO in the MT growth. T1 and T2 are the temperatures at which the slow cooling begins and ends, respectively. (b) A two-dimensional map of MT-processed REBCO bulk types corresponding to the liquid phase statuses at the stage between T1 and T2, in terms of temperature and supersaturation. The “stable” region yields no nucleation or growth. The “metastable” region leads to the seed-induced growth. The “unstable” region results in the self-nucleation. The ellipses schematically refer to the liquid phase status at the slow cooling stage, i.e., temperature changing from T1 to T2, for the three kinds of wrong-processed REBCO bulks and a typical perfect bulk.

Image of FIG. 4.
FIG. 4.

(a) A type III failed YBCO bulk grown from commercial powders. (b) The corresponding recycled bulk grown with Tmax of 1115 °C using a NdBCO/YBCO/MgO film seed.

Tables

Generic image for table
Table I.

Three types of failed REBCO bulks resulting from different non-optimized heating profiles. TE: the equilibrium temperature; TMeta: the critical temperature between metastable and unstable statuses.

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/content/aip/journal/jap/111/10/10.1063/1.4720400
2012-05-23
2014-04-25
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Recycling failed bulk YBCO superconductors using the NdBCO/YBCO/MgO film-seeded top-seeded melt growth method
http://aip.metastore.ingenta.com/content/aip/journal/jap/111/10/10.1063/1.4720400
10.1063/1.4720400
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