title: Superconducting double perovskite bismuth oxide prepared by a low-temperature hydrothermal reaction.
abstract: Perovskite-type structures (ABO3) have received significant attention because of their crystallographic aspects and physical properties, but there has been no clear evidence of a superconductor with a double-perovskite-type structure, whose different elements occupy A and/or B sites in ordered ways. In this report, hydrothermal synthesis at 220 °C produced a new superconductor with an A-site-ordered double perovskite structure, (Na(0.25)K(0.45))(Ba(1.00))3(Bi(1.00))4O12, with a maximum T(c) of about 27 K.
authors.affiliation: Center for Crystal Science and Technology, University of Yamanashi, 7-32 Miyamae Kofu 400-8511 (Japan).
authors.forename: Mirza H K
authors.initials: MH
authors.lastname: Rubel
authors.forename: Akira
authors.initials: A
authors.lastname: Miura
authors.forename: Takahiro
authors.initials: T
authors.lastname: Takei
authors.forename: Nobuhiro
authors.initials: N
authors.lastname: Kumada
authors.forename: M
authors.initials: M
authors.lastname: Mozahar Ali
authors.forename: Masanori
authors.initials: M
authors.lastname: Nagao
authors.forename: Satoshi
authors.initials: S
authors.lastname: Watauchi
authors.forename: Isao
authors.initials: I
authors.lastname: Tanaka
authors.forename: Kengo
authors.initials: K
authors.lastname: Oka
authors.forename: Masaki
authors.initials: M
authors.lastname: Azuma
authors.forename: Eisuke
authors.initials: E
authors.lastname: Magome
authors.forename: Chikako
authors.initials: C
authors.lastname: Moriyoshi
authors.forename: Yoshihiro
authors.initials: Y
authors.lastname: Kuroiwa
authors.forename: A K M
authors.initials: AK
authors.lastname: Azharul Islam
keywords: Rietveld refinement; X-ray diffraction; electronic band structure; hydrothermal synthesis; superconductors