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 01 04:00:00 EST 2010 · J. Sol. State Chem.

DOI:https://doi.org/10.1016/j.jssc.2009.12.007· OSTI ID:973036

Shi, Y G; Guo, Y F; Yu, S; Arai, M; Belik, A A; Sato, A; Yamaura, K; Takayama-Muromachi, E; Varga, T; Mitchell, J F

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.

• Research Organization: Argonne National Laboratory (ANL)
• Sponsoring Organization: SC; WPI Initiative on Materials Nanoarchitestonics; Grants-in-Aid for Scientific Research
• DOE Contract Number: AC02-06CH11357
• OSTI ID: 973036
• Report Number(s): ANL/MSD/JA-65841
• Journal Information: J. Sol. State Chem., Journal Name: J. Sol. State Chem. Journal Issue: 2 ; Feb. 2010 Vol. 183; ISSN 0022-4596; ISSN JSSCBI
• Country of Publication: United States
• Language: ENGLISH

Related Subjects

36 MATERIALS SCIENCE
CRYSTAL GROWTH
CRYSTAL STRUCTURE
ELECTRIC CONDUCTIVITY
ELECTRONIC STRUCTURE
GROUND STATES
MAGNETIC PROPERTIES
OSMIUM OXIDES
SODIUM OXIDES
SPECIFIC HEAT