Fabrication of PbO-Type Structure β-FeSe Superconductor Ceramics by Solid State Reaction Method

Yun Yi Wu; Jian Gao; Tao Li; Zhi Qiang Hua

doi:10.4028/www.scientific.net/AMR.790.21

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HomeAdvanced Materials ResearchAdvanced Materials Research Vol. 790Fabrication of PbO-Type Structure β-FeSe...

Fabrication of PbO-Type Structure β-FeSe Superconductor Ceramics by Solid State Reaction Method

Abstract:

PbO-type structure β-FeSe superconductor ceramic were successfully prepared by solid state sinter method in high vacuum state. The structures of the ceramics were investigated by X-ray diffraction and scanning electron microscopy. X-ray diffraction indicates that the sample prepared by two-steps method exhibited a much improved crystallinity. And as sintering temperature increases to 700°C, secondary phase Fe₇Se₈ phase peak disappear and α-Fe peak weakened. Besides, the ceramic prepared in 700°C exhibited a denser surface morphology in comparison to that prepared in 410°C and its composition is closer to the chemical formula FeSe according to EDX compositional analyses. It was noted that the resistivity of the sample, sintered at 700°C using two-steps sinter method, shows a linear metallic behavior from room temperature and onset is around T = 7.5 K.

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Periodical:

Advanced Materials Research (Volume 790)

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21-24

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.790.21

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Online since:

September 2013

Authors:

Yun Yi Wu, Jian Gao, Tao Li, Zhi Qiang Hua

Keywords:

Ceramic, Resistivity, Solid-State Reaction, Superconductor

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