Neodymium-barium-copper-oxide bulk superconductor and process fo

Superconductor technology: apparatus – material – process – High temperature – per se – Copper containing

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505450, 505500, 505785, C04B 35653

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active

059814420

ABSTRACT:
An Nd-Ba-Cu-O bulk superconductor includes oxide including metallic elements of neodymium (Nd), barium (Ba) and copper (Cu), and has a structure in which fine particles of Nd.sub.4 Ba.sub.2 Cu.sub.2 O.sub.10 (i.e., Nd422) are dispersed uniformly in crystalline grains of NdBa.sub.2 Cu.sub.3 O.sub.x (i.e., Nd123). It is produced by preparing a mixture powder in which an Nd123 powder and an Nd422 powder are present uniformly, thermally treating the mixture powder in a temperature range where the Nd123 powder melts partially at least but the Nd422 powder hardly melts, and gradually cooling the partially melted mixture powder in a temperature range around a solidifying point of the Nd123 powder. It exhibits an enhanced magnetic-field-trapping capability in the regions of low magnetic field, because of the pinning effect resulting from the fine particles of Nd422 dispersed uniformly in the crystalline grains of Nd123.

REFERENCES:
patent: 4942151 (1990-07-01), Capone et al.
patent: 5114905 (1992-05-01), Giessen et al.
patent: 5525584 (1996-06-01), Murakami et al.
Superconduct. Sci. Technol. 9 (1996) 1015-1032. "Topical Review, Melt-processed light rate earch element-Ba-Cu-O"; M Murakami, et al, Jun., 1996.

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