Effects of High-Energy Ball Milling Time on the Sintering Process of FeSe Superconductors

Abstract:

FeSe superconducting bulks were prepared with high energy ball milling (HEBM) aided sintering process, within which process, tetragonal β-FeSe superconducting phase could be formed directly with one step sintering process, and the formation of hexagonal δ-FeSe non-superconducting phase was effectively avoided. The influences of HEBM time on the sintering process of FeSe bulks were systematically investigated. With different HEBM time, the phase composition and morphology of precursor powders changed correspondingly, which thus influenced the final phase composition and superconducting properties of FeSe superconducting bulks. Due to the formation of FeSe bulks with larger tetragonal phase content and higher superconducting transition temperature, HEBM time of 6.0 h was recognized as the optimal parameter. Shorter HEBM time could lead to the insufficient decrease of particle size and low density. While longer HEBM time caused the formation of amorphous hexagonal δ-FeSe, which crystallized during sintering process. Thus no more tetragonal FeSe could be obtained. The FeSe superconducting bulk with the critical temperature T_c(onset) of 8.0 K was obtained with the HEBM time of 6 h, and sintering temperature of 700 ^oC for 12 h.

• Periodical: Materials Science Forum (Volume 848)
• Pages: 657-663
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.848.657
• Online since: March 2016
• Authors: Sheng Nan Zhang, Xiao Bo Ma, Ji Xing Liu, Jian Qing Feng, Cheng Shan Li, Ping Xiang Zhang
• Keywords: Critical Temperature, FeSe, High Energy Ball Milling, Superconductor

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