空气气氛下熔盐法合成β-FeSe(英文)

Synthesis of β-FeSe by Salt-Flux Method under Air Atmosphere

使用传统方法制备β-FeSe铁基超导体需要隔绝空气的真空条件,反应温度通常超过800oC.本文采用LiCl/NaCl/KCl熔盐法在空气条件下得到β-FeSe铁基超导体.制备过程简单,不需要在真空条件下封管处理,熔盐的使用有效降低了反应温度,并阻止反应物和产物在空气中氧化.粉末X射线衍射和Rietveld分析结果表明产物纯度较高.电性和磁性测试表明β-FeSe在8 K附近有超导性出现.

β-FeSe is typically prepared under vacuum at high temperatures exceeding 800 ℃. Here we develop a new LiCI/NaCI/KCI flux method to successfully synthesize β-FeSe under air atmosphere. The synthetic procedure is simple and without evacuation pretreatment. The flux effectively decreases the synthetic temperature and protects the reactants and products from air. X-ray diffraction data and Rietveld analysis show that the product has high purity. Magnetic and electrical measurements confirm that all samples obtained show superconductivity below 8 K.