The phase evolution mechanism in Fe(Se, Te) system

Liu, Jixing; Li, Chengshan; Zhang, Shengnan; Feng, Jianqing; Zhang, Pingxiang; Zhou, Lian

doi:10.1016/j.physc.2016.06.006

Cited by 9 publications

(2 citation statements)

References 26 publications

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“…Meanwhile, hexagonal phase δ-Fe(Se, Te) is also visible in all of these samples. Based on our previous study, the Fe content of 50 atom % is not in the single tetragonal phase region, so the appearance of the δ-Fe(Se, Te) phase cannot be avoided . Meanwhile, the diffraction peaks of both Ag and Fe 2 O 3 can be observed in the x = 0.01 and 0.05 Ag/O-codoped samples.…”

Section: Resultssupporting

confidence: 64%

“…Based on our previous study, the Fe content of 50 atom % is not in the single tetragonal phase region, so the appearance of the δ-Fe(Se, Te) phase cannot be avoided. 36 Meanwhile, the diffraction peaks of both Ag and Fe 2 O 3 can be observed in the x = 0.01 and 0.05 Ag/O-codoped samples. More details of the lattice structures were obtained based on Rietveld refinement and are listed in Table 1.…”

Section: ■ Results and Discussionmentioning

confidence: 93%

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Improving Superconducting Performance of Fe(Se, Te) with In Situ Formed Grain-Boundary Strengthening and Flux Pinning Centers

Liu

Shao

Liu

et al. 2022

ACS Appl. Mater. Interfaces

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It is well known that the existence of interstitial Fe is a great obstacle to enhancing the superconducting properties of the Fe(Se, Te) system. In this work, a silver and oxygen codoping effect toward enhancement of the superconductivity and flux pinning in Fe(Se, Te) bulks is reported. The oxygen ions from SeO 2 can induce the precipitation of interstitial Fe as Fe 2 O 3 , thus simultaneously optimizing the superconducting properties of Fe(Se, Te) and forming extra flux pinning centers, while the existence of Ag can enhance the intergrain connections of the polycrystalline material by improving the electron transport at grain boundaries. Compared with the undoped sample, the critical current density, the upper critical field, and the thermally activated flux flow activation energy are greatly enhanced by 4.7, 1.7, and 1.5 times, respectively. The novel synthesis technique and optimized properties of this work can pave the way for the development of high-performance Fe(Se, Te) superconducting wires or tapes.

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Section: Resultssupporting

confidence: 64%

Section: ■ Results and Discussionmentioning

confidence: 93%