title: Synthesis and characterization of a magnetic semiconductor Na(2)RuO(4) containing one-dimensional chains of Ru(6+).
abstract: A new ternary ruthenium oxide Na(2)RuO(4) was prepared and shown to crystallize with a new structure type. Single crystal X-ray diffraction measurements reveal that Na(2)RuO(4) consists of RuO(4) chains made up of RuO(5) trigonal bipyramids by sharing axial corners. Na(2)RuO(4) is a magnetic semiconductor with a variable range hopping behavior, and its molar magnetic susceptibility chi(mol) has a broad maximum at approximately 74 K. The derivative d(chi(mol).T)/dT exhibits a peak at 37.7 K which has been confirmed by heat capacity measurement to be due to long-range antiferromagnetic ordering.
authors.affiliation: Institut de Chimie de la Matière Condensée de Bordeaux (ICMCB-CNRS), 87 Avenue du Docteur Schweitzer, 33608 Pessac Cedex, France.
authors.forename: Masahiro
authors.initials: M
authors.lastname: Shikano
authors.forename: Reinhard K
authors.initials: RK
authors.lastname: Kremer
authors.forename: Martin
authors.initials: M
authors.lastname: Ahrens
authors.forename: H-J
authors.initials: HJ
authors.lastname: Koo
authors.forename: M-H
authors.initials: MH
authors.lastname: Whangbo
authors.forename: Jacques
authors.initials: J
authors.lastname: Darriet