物理化学学报 >> 2014, Vol. 30 >> Issue (9): 1611-1615.doi: 10.3866/PKU.WHXB201406201

热力学,动力学和结构化学 上一篇    下一篇

低温合成超导体Ba1-xKxBiO3

刘孟1, 李国宝2, 王稼国1, 廖复辉2, 林建华2   

  1. 1. 温州大学化学与材料工程学院, 浙江温州 325035;
    2. 北京大学化学与分子工程学院, 北京分子科学国家实验室, 稀土材料化学及应用国家重点实验室, 北京 100871
  • 收稿日期:2014-04-08 修回日期:2014-06-20 发布日期:2014-08-29
  • 通讯作者: 李国宝, 王稼国, 林建华 E-mail:liguobao@pku.edu.cn;jiagle@126.com;jhlin@pku.edu.cn
  • 基金资助:

    国家自然科学基金(21271014)和国家重点基础研究发展规划项目(973)(2010CB833103)资助

Low-Temperature Synthesis of Superconductor Ba1-xKxBiO3

LIU Meng1, LI Guo-Bao2, WANG Jia-Guo1, LIAO Fu-Hui2, LIN Jian-Hua2   

  1. 1. College of Chemistry and Materials Engineering, Wenzhou University, Wenzhou 325035, Zhejiang Province, P. R. China;
    2. Beijing National Laboratory for Molecular Sciences, State Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, P. R. China
  • Received:2014-04-08 Revised:2014-06-20 Published:2014-08-29
  • Contact: LI Guo-Bao, WANG Jia-Guo, LIN Jian-Hua E-mail:liguobao@pku.edu.cn;jiagle@126.com;jhlin@pku.edu.cn
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (21271014) and National Key Basic Research Program of China (973) (2010CB833103).

摘要:

先以BaCO3和Bi2O3为原料由传统的固相反应制备纯BaBiO3,然后在低温下将用KOH-KF熔盐处理这样的拓扑反应合成了Ba1-xKxBiO3超导体. 所有样品均进行了粉末X射线衍射(XRD)和磁性表征. XRD结果表明,所得Ba1-xKxBiO3样品均为纯相,且均可用赝立方晶胞指标化. 磁性测量表明所有样品具有超导电性,最高超导转变温度(Tc)为30.6 K. 讨论了反应时间、前驱体与熔盐质量比对超导转变温度的影响. 最佳的反应条件为:反应温度450 ℃,反应时间4 h,BaBiO3:KOH:KF质量比1:5:2.5.

关键词: Ba1-xKxBiO3, X射线衍射, 铋酸盐超导体, 拓扑反应

Abstract:

Ba1-xKxBiO3 (BKBO) was synthesized using a topotactic reaction, which involves a conventional solidstate synthesis of pure BaBiO3, using BaCO3 and Bi2O3 as the raw materials, and subsequent treatment of BaBiO3 in a KOH flux at low temperature. All samples were characterized using X-ray diffraction (XRD) and magnetic susceptibility measurements. The XRD patterns show that there is no apparent impurity in the obtained Ba1-xKxBiO3 samples, and all the diffraction data can be indexed using a pseudo-cubic cell. All the samples showed superconductivity, and the highest superconducting transition temperature (Tc) was 30.6 K. The influences of the reaction time and the ratio of the precursor to the molten salts on the transition temperature were investigated. The best reaction conditions were treatment at 450 ℃ for 4 h, with BaBiO3:KOH:KF mass ratio of 1:5:2.5.

Key words: Ba1-xKxBiO3, X-ray diffraction, Bismuthate superconductor, Topotactic reaction

MSC2000: 

  • O646