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200517.fm Page 14 Friday, March 18, 2005 2:52 PM
2005
Electric properties
D 8000
High-Pressure Synthesis, Crystal Structure Determination, and a Ca Substitution
of the Metallic Rhodium Oxide NaRh2O4. — Samples of Na1-xCa xRh 2O4
17- 014 Study
(x = 0, 0.25, 0.5, 0.75, 1) are synthesized by solid state reaction from stoichiometric
mixtures of CaO, Rh2O3, and KClO4 (1500 °C, 1 h, 6 GPa). As revealed by powder neutron diffraction and single crystal XRD the title compound and CaRh2O4 crystallize in
the orthorhombic space group Pnma with Z = 4. NaRh2O4 exhibits metallic behavior.
Ca substitution for Na dramatically alters the metallic state, and a peculiar magnetism
develops in the low Na concentration range. The pure Ca sample is electrically insulating. — (YAMAURA*, K.; HUANG, Q.; MOLDOVAN, M.; YOUNG, D. P.; SATO, A.;
BABA, Y.; NAGAI, T.; MATSUI, Y.; TAKAYAMA-MUROMACHI, E.; Chem.
Mater. 17 (2005) 2, 359-365; Supercond. Mater. Cent., Natl. Inst. Mater. Sci., Tsukuba,
Ibaraki 305, Japan; Eng.) — W. Pewestorf
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