High-pressure crystal growth and magnetic and electrical properties of the quasi-one dimensional osmium oxide Na{sub 2}OsO{sub 4}

Journal Article · Mon Feb 15 00:00:00 EST 2010 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/j.jssc.2009.12.007· OSTI ID:21372497

Shi, Y G; Guo, Y F ^[1]; Yu, S ^[2]; Arai, M ^[3]; Belik, A A ^[1]; Sato, A ^[4]; Yamaura, K ^[2]; Takayama-Muromachi, E ^[1]

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1. International Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science, Tsukuba, Ibaraki 305-0044 (Japan)
2. JST, Transformative Research-Project on Iron Pnictides (TRIP), 5 Sanbancho, chiyoda-ku, Tokyo 102-0075 (Japan)
3. Computational Materials Science Center, National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki 305-0044 (Japan)
4. Materials Analysis Station, National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki 305-0044 (Japan)

Na{sub 2}OsO{sub 4} crystals were grown by a NaCl flux method under high pressure. It crystallizes in the Ca{sub 2}IrO{sub 4}-type structure without having additional elements or metal vacancies, which are usually accommodated. It appears that Na{sub 2}OsO{sub 4} is a metal-stoichiometric Ca{sub 2}IrO{sub 4}-type compound never been synthesized to date. Na{sub 2}OsO{sub 4} has the octahedral environment of Os{sup 6+}O{sub 6} so that the electronic configuration is 5d{sup 2}, suggesting the magnetic S=1 ground state. However, magnetization, electrical resistivity, and specific heat measurements indicated that the non-magnetic S=0 state is much likely for Na{sub 2}OsO{sub 4} than the S=1 state. Band structure calculations and the structure analysis found that the disagreement is probably due to the statically uniaxial compression of the OsO{sub 6} octahedra, resulting in splitting of the t{sub 2{sub g}} band. - Graphical abstract: Na{sub 2}OsO{sub 4} crystals were grown by a NaCl flux method under high pressure. It crystallizes in the Ca{sub 2}IrO{sub 4}-type structure comprising infinite Os{sup 6+}O{sub 6} octahedra (5d{sup 2}) chains. The crystal growth, the crystal structure, and the magnetic and electrical properties are reported.

• OSTI ID: 21372497
• Journal Information: Journal of Solid State Chemistry, Vol. 183, Issue 2; Other Information: DOI: 10.1016/j.jssc.2009.12.007; PII: S0022-4596(09)00570-2; Copyright (c) 2009 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; ISSN 0022-4596
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CRYSTAL GROWTH
ELECTRIC CONDUCTIVITY
ELECTRONIC STRUCTURE
IRIDIUM OXIDES
MAGNETIZATION
OSMIUM IONS
OSMIUM OXIDES
SODIUM CHLORIDES
SODIUM OXIDES
SPECIFIC HEAT
SYNTHESIS
VACANCIES
ALKALI METAL COMPOUNDS
CHALCOGENIDES
CHARGED PARTICLES
CHLORIDES
CHLORINE COMPOUNDS
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
ELECTRICAL PROPERTIES
HALIDES
HALOGEN COMPOUNDS
IONS
IRIDIUM COMPOUNDS
OSMIUM COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
POINT DEFECTS
REFRACTORY METAL COMPOUNDS
SODIUM COMPOUNDS
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS