Improvement in structure and superconductivity of bulk FeSe0.5Te0.5 superconductors by optimizing sintering temperature

Improvement in structure and superconductivity of bulk FeSe0.5Te0.5 superconductors by optimizing sintering temperature
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通过优化烧结温度改善块体FeSe0.5Te0.5超导体的结构和超导性能

DOI:
10.1016/j.scriptamat.2015.09.039
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发表时间:
2016-02
期刊:
影响因子:
6
通讯作者:
Huijun Li
Huijun Li
中科院分区:
材料科学1区
文献类型:
--
作者:
Yongchang Liu;Zongqing Ma;Liming Yu;Huijun Li

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烧结温度对两步烧结法制备的多晶FeSe 0. 5 Te 0. 5块材的相结构和显微结构的演变起着至关重要的作用,从而显著影响其超导性能。第二步提高烧结温度(600-700 °C)有利于Te取代到超导相中,导致晶格畸变增加,从而有助于提高超导性(T达到15.6K)。同时,高温烧结促进了超导晶粒的生长和均匀性的提高,是导致超导转变的主要原因。
Sintering temperature plays a vital role in the evolution of phase structure and microstructure in polycrystalline FeSe0.5Te0.5bulks fabricated by the two-step sintering method, and thus significantly influences their superconducting properties. Elevated sintering temperature (600–700 °C) at second step facilitates the substitution of Te into the superconducting phase, which leads to the increased lattice distortion and thus contributes to the enhancement of superconductivity (the value ofTcreaches 15.6 K). At the same time, the accelerated growth of the superconducting grains and the improved homogeneity motivated by elevated sintering temperature serve as the main reason for the sharp superconducting transition.
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