Synthesis and characterization of Na03RhO206H2O - a semiconductor with a weak ferromagnetic component

Details Synthesis and characterization of Na03RhO206H2O - a semiconductor with a weak ferromagnetic component Synthesis and characterization of Na03RhO206H2O - a semiconductor with a weak ferromagnetic component

2005-03-31

arxiv.org/abs/cond-mat/0504007v1

Physics

Condensed Matter

Materials Science

15 fages 5 figures Solid State Communications in print

Scientific paper

10.1016/j.ssc.2005.03.063

We have prepared the oxyhydrate Na03RhO206H2O by extracting Na+ cations from NaRhO2 and intercalating water molecules using an aqueous solution of Na2S2O8. Synchrotron X-ray powder diffraction, thermogravimetric analysis (TGA), and energy-dispersive x-ray analysis (EDX) reveal that a non-stoichiometric Na03(H2O)06 network separates layers of edge-sharing RhO6 octahedra containing Rh3+(4d6, S=0) and Rh4+ (4d5, S=1/2). The resistivities of NaRhO2 and Na03RhO206H2O (T < 300) reveal insulating and semi-conducting behavior with activation gaps of 134 meV and 7.8 meV, respectively. Both Na03RhO206H2O and NaRhO2 show paramagnetism at room temperature, however, the sodium-deficient sample exhibits simultaneously a weak but experimentally reproducible ferromagnetic component. Both samples exhibit a temperature-independent Pauli paramagnetism, for NaRhO2 at T > 50 K and for Na03RhO206H2O at T > 25 K. The relative magnitudes of the temperature-independent magnetic susceptibilities, that of the oxide sample being half that of the oxyhydrate, is consistent with a higher density of thermally accessible electron states at the Fermi level in the hydrated sample. At low temperatures the magnetic moments rise sharply, providing evidence of localized and weakl -ordered electronic spins.

Affiliated with

Also associated with

No associations

Rating

Synthesis and characterization of Na03RhO206H2O - a semiconductor with a weak ferromagnetic component does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Synthesis and characterization of Na03RhO206H2O - a semiconductor with a weak ferromagnetic component, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Synthesis and characterization of Na03RhO206H2O - a semiconductor with a weak ferromagnetic component will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-603065