1. Domain growth in partially melted bulk Nd1+xBa2−xCu3O7−δ
- Author
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M. Tomaselli, B. Molinas, F. Gerolin, M. Marella, B. Burtet Fabris, and L. Meregalli
- Subjects
Superconductivity ,Materials science ,Morphology (linguistics) ,Mechanical Engineering ,Nucleation ,Mineralogy ,Mechanics of Materials ,Chemical physics ,Domain (ring theory) ,Perpendicular ,General Materials Science ,Oxygen pressure ,Dissolution ,Stoichiometry - Abstract
Domain growth of bulk partially melted Nd1+xBa2−xCu3O7−δ in air was found to be severely limited by liquid-phase segregation and losses. The use of a reduced oxygen pressure greatly improved the stoichiometry control, leading to the formation of well-developed domains and enhanced superconducting properties. Direct nucleation of Nd1+xBa2−xCu3O7−δ from the liquid phase by dissolution of Nd2BaCuO5 and a spiral growth mechanism in three perpendicular directions of the platelets stacked in the domains, are suggested.
- Published
- 1996
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