Structural and physical properties of the 6H BaRuO 3 polymorph synthesized under high pressure
Abstract
The single-phase 6H BaRuO 3 with the hexagonal BaTiO 3 structure was synthesized at 5 GPa and 1000 °C. Rietveld refinement of the powder X-ray data for the 6H phase resulted in the lattice parameters to be a=5.7127(1) Å and c=14.0499(2) Å; the average Ru-O distance and direct Ru-Ru distance in the Ru 2O 9 dioctahedron being 1.992(6) and 2.5658(14) Å, respectively. The electrical resistivity of the 6H BaRuO 3 follows a relationship of ρ versus T3/2 below 60.0 K, a signature deviation from the Fermi-liquid behavior. Both magnetic susceptibility and specific heat data indicate that the 6H BaRuO 3 is an exchange-enhanced Pauli paramagnet due to the electron correlation effect with large Wilson ratio RW and Stoner enhancement factor. The comprehensive evolution of transport and magnetic properties from 9R across 4H to 6H BaRuO 3 was discussed.
- Publication:
-
Journal of Solid State Chemistry France
- Pub Date:
- October 2007
- DOI:
- 10.1016/j.jssc.2007.07.031
- Bibcode:
- 2007JSSCh.180.2816Z