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Fe-Doping Effect on the Bi3Ni Superconductor Microstructure

2017; Associação Brasileira de Metalurgia e Materiais (ABM); Associação Brasileira de Cerâmica (ABC); Associação Brasileira de Polímer; Volume: 20; Issue: 3 Linguagem: Inglês

10.1590/1980-5373-mr-2016-0538

ISSN

1980-5373

Autores

Silvio Henrique Gonsalves, João Frederico Haas Leandro Monteiro, Adriane Consuelo Da Silva Leal, André Vitor Chaves de Andrade, Gelson Biscaia de Souza, Ezequiel Costa Siqueira, Francisco Carlos Serbena, Alcione Roberto Jurelo,

Tópico(s)

Superconductivity in MgB2 and Alloys

Resumo

The substitution effects of Fe ion on the structure of the intermetallic Bi3Ni1-xFex (0 ≤ x ≤ 0.10) superconductor were studied. The morphology of samples consists of an inhomogeneous laminar slab-like microstructure. The main phase corresponds to Bi3Ni1-xFex with an orthorhombic structure (Pnma), but with very small quantities of impurities of BiNi and Bi as revealed by X-ray diffraction. SEM and AFM reveal that the Bi3Ni1-xFex phase consists of two regions. One region is Bi richer and Ni and Fe poorer than the other region. Raman spectroscopy revealed two phonon modes at room temperature. No significant changes were observed in the spectra with Fe doping and in different regions of the Bi3Ni1-xFex phase. Superconductivity is observed below a transition temperature TC = 4 K and regardless of iron doping.

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