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Title: Hydrothermal synthesis, crystal structure, and superconductivity of a double-perovskite Bi oxide
Authors: Rubel, MHK
Takei, T
Kumada, N
Ali, MM
Miura, A
Tadanaga, K
Oka, K
Azuma, M
Yashima, M
Fujii, K
Magome, E
Moriyoshi, C
Kuroiwa, Y
Hester, JR
Avdeev, M
Keywords: Perovskite
Bismuth oxides
Transition temperature
Neutron diffraction
X-ray diffraction
Transmission electron microscopy
Crystal structure
Issue Date: 23-Dec-2015
Publisher: American Chemical Society
Citation: Rubel, M. H. K., Takei, T., Kumada, N., Ali, M. M., Miura, A., Tadanaga, K., Oka, K., Azuma, M., Yashima, M., Fujii, K., Magome, E., Moriyoshi, C., Kuroiwa, Y., Hester, J. R., & Avdeev, M. (2015). Hydrothermal synthesis, crystal structure, and superconductivity of a double-perovskite Bi oxide. Chemistry of Materials, 28(2), 459–465. doi:10.1021/acs.chemmater.5b02386
Abstract: Double-perovskite Bi oxides are a new series of superconducting materials, and their crystal structure and superconducting properties are under investigation. In this paper, we describe the synthesis and characterization of a new double-perovskite material that has an increased superconductive transition temperature of 31.5 K. The structure of the material was examined using powder neutron diffraction (ND), synchrotron X-ray diffraction (SXRD), and transmission electron microscopy (TEM). Rietveld refinement of the sample based on ND and SXRD data confirmed an A-site-ordered (K1.00)(Ba1.00)3(Bi0.89Na0.11)4O12 double-perovskite-type structure with the space group Im3̅m (No. 229). This structural analysis revealed the incorporation of Na with Bi in the structure and a bent bond between (Na, Bi)–O–(Na, Bi). TEM analyses also confirmed a cubic double-perovskite structure. This hydrothermally synthesized compound exhibited a large shielding volume fraction, exceeding 100%, with onset of superconductivity at ∼31.5 K. Its electrical resistivity dropped near onset at ∼28 K, and zero resistivity was confirmed below 13 K. The calculated band structure revealed that the metallicity of the compound and the flatness of the conduction bands near the Fermi level (EF) are important for the appearance of superconductivity. © 2015 American Chemical Society
ISSN: 1520-5002
Appears in Collections:Journal Articles

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