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Annealing Effect of FeSe Superconducting Polycrystalline Bulks in Low Oxygen Atmosphere
IEEE Transactions on Applied Superconductivity ( IF 1.8 ) Pub Date : 2021-06-21 , DOI: 10.1109/tasc.2021.3091036 Botao Shao , Tianzi Yang , Shengnan Zhang , Jixing Liu , Wen Zhang , Hao Cao , Jianqing Feng , Chengshan Li , Pingxiang Zhang
IEEE Transactions on Applied Superconductivity ( IF 1.8 ) Pub Date : 2021-06-21 , DOI: 10.1109/tasc.2021.3091036 Botao Shao , Tianzi Yang , Shengnan Zhang , Jixing Liu , Wen Zhang , Hao Cao , Jianqing Feng , Chengshan Li , Pingxiang Zhang
FeSe superconducting bulks with different Fe contents were prepared by high energy ball milling aided sintering process followed by a post annealing process in low oxygen atmosphere. The influences of Fe content, annealing temperature and oxygen partial pressure have been systematically studied. It was found that both the critical temperature and superconducting phase volume ratio have been obviously improved with annealing. However, the effect of oxygen annealing process on FeSe polycrystalline bulks was different with that on FeSe single crystals. In polycrystalline bulks, the annealing process could further promote the phase transition from nonsuperconducting hexagonal δ-FeSe phase to superconducting tetragonal β-FeSe phase. Meanwhile, the chemical composition uniformity has also been enhanced with no obvious FeO
δ phase detected by X-Ray Diffraction. With optimized annealing process under the oxygen partial pressure of 5% at 400 °C for 10 h, FeSe superconducting bulks have reached the critical temperature of 9.1 K.
中文翻译:
FeSe超导多晶块体在低氧气氛下的退火效果
通过高能球磨辅助烧结工艺,然后在低氧气氛中进行后退火工艺,制备了具有不同 Fe 含量的 FeSe 超导块体。系统研究了Fe含量、退火温度和氧分压的影响。发现临界温度和超导相体积比均随着退火得到明显改善。然而,氧退火工艺对 FeSe 多晶块体的影响与对 FeSe 单晶的影响不同。在多晶块体中,退火过程可以进一步促进从非超导六方 δ-FeSe 相到超导四方 β-FeSe 相的相变。同时,化学成分的均匀性也有所提高,没有明显的FeO δX 射线衍射检测到的相位。通过在 5% 氧分压下在 400°C 下进行 10 小时的优化退火工艺,FeSe 超导块体已达到 9.1 K 的临界温度。
更新日期:2021-07-27
中文翻译:
FeSe超导多晶块体在低氧气氛下的退火效果
通过高能球磨辅助烧结工艺,然后在低氧气氛中进行后退火工艺,制备了具有不同 Fe 含量的 FeSe 超导块体。系统研究了Fe含量、退火温度和氧分压的影响。发现临界温度和超导相体积比均随着退火得到明显改善。然而,氧退火工艺对 FeSe 多晶块体的影响与对 FeSe 单晶的影响不同。在多晶块体中,退火过程可以进一步促进从非超导六方 δ-FeSe 相到超导四方 β-FeSe 相的相变。同时,化学成分的均匀性也有所提高,没有明显的FeO δX 射线衍射检测到的相位。通过在 5% 氧分压下在 400°C 下进行 10 小时的优化退火工艺,FeSe 超导块体已达到 9.1 K 的临界温度。