低温合成超导体Ba1-xKxBiO3

doi:10.3866/PKU.WHXB201406201

Abstract

Abstract:

Ba_1-xK_xBiO₃ (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 Ba_1-xK_xBiO₃ 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 (T_c) 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: Ba_1-xK_xBiO₃, X-ray diffraction, Bismuthate superconductor, Topotactic reaction

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LIU Meng, LI Guo-Bao, WANG Jia-Guo, LIAO Fu-Hui, LIN Jian-Hua. Low-Temperature Synthesis of Superconductor Ba_1-xK_xBiO₃[J]. Acta Phys. -Chim. Sin. 2014, 30(9), 1611-1615. doi: 10.3866/PKU.WHXB201406201

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Low-Temperature Synthesis of Superconductor Ba_1-xK_xBiO₃

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Low-Temperature Synthesis of Superconductor Ba_1-xK_xBiO₃