Structural and physical properties of the 6H BaRuO3 polymorph synthesized under high pressure

✍ Scribed by J.G. Zhao; L.X. Yang; Y. Yu; F.Y. Li; R.C. Yu; Z. Fang; L.C. Chen; C.Q. Jin

• Publisher: Elsevier Science
• Year: 2007
• Tongue: English
• Weight: 664 KB
• Volume: 180
• Category: Article
• ISSN: 0022-4596
• DOI: 10.1016/j.jssc.2007.07.031

✦ Synopsis

The single-phase 6H BaRuO 3 with the hexagonal BaTiO 3 structure was synthesized at 5 GPa and 1000 1C. Rietveld refinement of the powder X-ray data for the 6H phase resulted in the lattice parameters to be a ¼ 5.7127(1) A ˚and c ¼ 14.0499(2) A ˚; the average Ru-O distance and direct Ru-Ru distance in the Ru 2 O 9 dioctahedron being 1.992(6) and 2.5658(14) A ˚, respectively. The electrical resistivity of the 6H BaRuO 3 follows a relationship of r versus T 3/2 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 R W and Stoner enhancement factor. The comprehensive evolution of transport and magnetic properties from 9R across 4H to 6H BaRuO 3 was discussed.