Acta Phys. -Chim. Sin. ›› 2014, Vol. 30 ›› Issue (9): 1611-1615.doi: 10.3866/PKU.WHXB201406201

• THERMODYNAMICS, KINETICS, AND STRUCTURAL CHEMISTRY • Previous Articles     Next Articles

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).

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