resumo
Bi-Sr-Ca-Cu-O (BSCCO) superconducting fibres were grown using the laser floating zone technique assisted by a dc electrical current (electrically assisted laser floating zone-EALFZ process). The simultaneous effect of pulling rate and applied current intensity was evaluated on the premises of the: (i) elemental partition coefficient between solid and molten zone; (ii) phase development; (iii) crystal size and alignment degree of the primary and superconducting phases; (iv) phase transformation during heat treatment and (v) superconducting properties. The highest critical current density value (J(C) = 2240 A cm(-2)) was obtained for the fibres pulled at intermediate pulling rates (75 mm h (1)) grown under a maximum dc electric current intensity (200 mA).
palavras-chave
O SUPERCONDUCTING FIBERS; EPITAXIAL-GROWTH; FIELD; TEMPERATURE; INTERFACE; BI-2223
categoria
Physics
autores
Carrasco, MF; Silva, RF; Vieira, JM; Costa, FM
nossos autores
Joaquim Manuel Vieira
Professor Catedrático
Rui Ramos Ferreira e Silva
Professor associadoGrupos
2 - nanoestruturas e cerâmicos ferróicos multifuncionais
3 - materiais de carbono, compósitos e revestimentos funcionais
agradecimentos
The authors gratefully acknowledge the FCT for financial support (Project PTDC/CTM/66195/2006).