中文摘要：

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800 ℃. 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.

英文摘要：

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.