Preparation of the Orthorhombic Lix(C2H8N2)yFe2Se2 Superconductor by Amine Exchange Method

A new FeSe‐based superconductor Lix(C2H8N2)yFe2Se2 with Tc=30 K was successfully synthesized by substituting ethylenediamine(en) for ammonia molecules in Lix(NH3)yFe2Se2. The XRD pattern indicates that the intercalation compound is an orthorhombic structure with lattice parameters a=3.8517(7)Å, b=3....

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Bibliographic Details
Published in:ChemistrySelect (Weinheim) 2019-07, Vol.4 (28), p.8201-8206
Main Authors: Gao, Zhan, Zhu, Baichuan, Xu, Han‐Shu, Xu, Wentao, Luo, Qinxin, Tang, Kaibin
Format: Article
Language:English
Subjects:
Amine exchange
Ethylenediamine
Iron-based superconductor
Orthorhombic
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Summary:A new FeSe‐based superconductor Lix(C2H8N2)yFe2Se2 with Tc=30 K was successfully synthesized by substituting ethylenediamine(en) for ammonia molecules in Lix(NH3)yFe2Se2. The XRD pattern indicates that the intercalation compound is an orthorhombic structure with lattice parameters a=3.8517(7)Å, b=3.9188(7)Å, c=21.4862(6)Å at room temperature, which is different from the tetrahedral phase Lix(C2H8N2)yFe2Se2 with Tc=45 K synthesized by solvothermal method. Compared with the precursor Lix(NH3)yFe2Se2, the Lix(C2H8N2)yFe2Se2 underwent a structure transition from tetrahedral to orthorhombic during the amine exchange reaction accompanying by the decrease of Tc, indicating that Tc is influenced by structure. An orthorhombic phase of Lix(C2H8N2)yFe2Se2 with Tc=30 K was synthesized by substituting ethylenediamine for ammonia molecules in Lix(NH3)yFe2Se2.
ISSN:2365-6549
2365-6549
DOI:10.1002/slct.201901207