High-pressure synthesis, crystal structure determination, and a Ca substitution study of the metallic rhodium oxide NaRh2O4

被引：37

作者：

Yamaura, K

Huang, Q

Moldovan, M

Young, DP

Sato, A

Baba, Y

Nagai, T

Matsui, Y

Takayama-Muromachi, E

机构：

[1] Natl Inst Mat Sci, Supercond Mat Ctr, Res Promot Div, Tsukuba, Ibaraki 3050044, Japan

[2] Natl Inst Mat Sci, Adv Mat Lab, Tsukuba, Ibaraki 3050044, Japan

[3] Natl Inst Stand & Technol, Ctr Neutron Res, Gaithersburg, MD 20899 USA

[4] Louisiana State Univ, Dept Phys & Astron, Baton Rouge, LA 70803 USA

来源：

CHEMISTRY OF MATERIALS | 2005年 / 17卷 / 02期

关键词：

D O I：

10.1021/cm0483846

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The sodium rhodate NaRh2O4 was synthesized for the first time and characterized by neutron and X-ray diffraction studies and measurements of magnetic susceptibility, specific heat, electrical resistivity, and the Seebeck coefficient. NaRh2O4 crystallizes in the CaFe2O4-type structure, which is comprised of a characteristic RhO6 octahedral network. The compound is metallic in nature, probably reflecting the 1: 1 mixed valence character of Rh(III) and Rh(IV) in the network. For further studies of the compound, the Rh valence was varied significantly by means of an aliovalent substitution: the full-range solid solution between NaRh2O4 and CaRh2O4 was achieved and characterized as well. The metallic state was dramatically altered, and a peculiar magnetism developed in the low Na concentration range.

引用

页码：359 / 365

页数：7

共 38 条

[1] SYNTHESIS AND CRYSTAL-STRUCTURE OF NATI2O4 - A NEW MIXED-VALENCE SODIUM TITANATE [J].