title: High-pressure synthesis, crystal structure, and magnetic properties of KSbO3-type 5doxides K0.84OsO3and Bi2.93Os3O11.
abstract: 5dSolid-state oxides K0.84OsO3(Os5.16+; 5d2.84) and Bi2.93Os3O11(Os4.40+; 5d3.60) were synthesized under high-pressure and high-temperature conditions (6 GPa and 1500-1700 °C). Their crystal structures were determined by synchrotron x-ray diffraction and their 5delectronic properties and tunnel-like structure motifs were investigated. A KSbO3-type structure with a space group ofIm-3 andPn-3 was determined for K0.84OsO3and Bi2.93Os3O11, respectively. The magnetic and electronic transport properties of the polycrystalline compounds were compared with those obtained theoretically. It was revealed that the 5dtunnel-like structures are paramagnetic with metallic charge conduction at temperatures above 2 K. This was similar to what was observed for structurally relevant 5doxides, including Bi3Re3O11(Re4.33+; 5d2.66) and Ba2Ir3O9(Ir4.66+; 5d4.33). The absence of long-range magnetic order seems to be common among 5dKSbO3-like oxides, regardless of the number of 5delectrons (between 2.6 and 4.3 per 5datom).
authors.affiliation: Superconducting Properties Unit, National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan; Graduate School of Chemical Sciences and Engineering, Hokkaido University, North 10 West 8, Kita-ku, Sapporo, Hokkaido 060-0810, Japan.
authors.forename: Yahua
authors.initials: Y
authors.lastname: Yuan
authors.affiliation: Superconducting Properties Unit, National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan; Graduate School of Chemical Sciences and Engineering, Hokkaido University, North 10 West 8, Kita-ku, Sapporo, Hokkaido 060-0810, Japan.
authors.forename: Hai L
authors.initials: HL
authors.lastname: Feng
authors.affiliation: Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China.
authors.forename: Youguo
authors.initials: Y
authors.lastname: Shi
authors.affiliation: Materials Processing Unit, National Institute for Materials Science, 1-2-1 Sengen, Tsukuba, Ibaraki 305-0047, Japan.
authors.forename: Yoshihiro
authors.initials: Y
authors.lastname: Tsujimoto
authors.affiliation: International Center for Materials Nanoarchitectonics (WPI-MANA), National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan.
authors.forename: Alexei A
authors.initials: AA
authors.lastname: Belik
authors.affiliation: Materials Analysis Station, National Institute for Materials Science, 1-2-1 Sengen, Tsukuba, Ibaraki 305-0047, Japan.
authors.forename: Yoshitaka
authors.initials: Y
authors.lastname: Matsushita
authors.affiliation: Computational Materials Science Center, National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan.
authors.forename: Masao
authors.initials: M
authors.lastname: Arai
authors.affiliation: Superconducting Properties Unit, National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan; Graduate School of Chemical Sciences and Engineering, Hokkaido University, North 10 West 8, Kita-ku, Sapporo, Hokkaido 060-0810, Japan.
authors.forename: Jianfeng
authors.initials: J
authors.lastname: He
authors.affiliation: Synchrotron X-ray Station at SPring-8, National Institute for Materials Science, Kohto 1-1-1, Sayo-cho, Hyogo 679-5148, Japan.
authors.forename: Masahiko
authors.initials: M
authors.lastname: Tanaka
authors.affiliation: Superconducting Properties Unit, National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan; Graduate School of Chemical Sciences and Engineering, Hokkaido University, North 10 West 8, Kita-ku, Sapporo, Hokkaido 060-0810, Japan.
authors.forename: Kazunari
authors.initials: K
authors.lastname: Yamaura
keywords: Bi3Os3O11; KOsO3; KSbO3-type; high-pressure synthesis; osmium oxide