The Structural and Electronic Properties of the Ru(V) Perovskites Ba2LaRu0.5Sb0.5O6 and Ba2TaRu0.5Na0.5O6

✍ Scribed by S.A. Almaer; P.D. Battle; P. Lightfoot; R.S. Mellen; A.V. Powell

• Publisher: Elsevier Science
• Year: 1993
• Tongue: English
• Weight: 260 KB
• Volume: 102
• Category: Article
• ISSN: 0022-4596
• DOI: 10.1006/jssc.1993.1048

✦ Synopsis

The compounds (\mathrm{Ba}{2} \mathrm{LaRu}{0.5} \mathrm{Sb}{0.5} \mathrm{O}{6}) and (\mathrm{Ba}{2} \mathrm{TaRu}{0.5} \mathrm{Na}{0.5} \mathrm{O}{6}) have been used to study the magnetic properties of (\mathrm{Ru}(\mathrm{V})) when present in low concentrations in a mixed metal oxide. (\mathrm{Ba}{2} \mathrm{TaKu}{0.5} \mathrm{Na}{0.5} \mathrm{O}{6}) is a simple cubic perovskite (\left(a_{0}=4.1321(5) \AA\right)) with a random distribution of (\mathrm{Ta}). (\mathrm{Ru}), and (\mathrm{Na}) over the sixcoordinate sites and a magnetic susceptibility that follows the Curie-Weiss Law (\left(\mu_{\mathrm{eff}}=3.44 \mu_{\mathrm{B}}, \theta=\right.) (-142 \mathrm{~K})). Neutron powder diffraction has been used to show that (\mathrm{Ba}{2} \mathrm{LaRu}{0.5} \mathrm{Sb}{0.5} \mathrm{O}{6}) is a distorted perovskite (space group (I-1 . a=6.0741(5), b=6.0895(5), c=8.6124(9) \AA, \alpha=89.93(1), \beta=) (90.39(1), \gamma=89.91(1)^{\circ}) ) with a 1 : I ordered arrangement of (\mathrm{La}) and (\mathrm{Ru} / \mathrm{Sb}) atoms over the six-coordinate sites. Again the magnetic susceptibility follows a Curie-Weiss law ( (\mu_{\mathrm{cif}}=3.78 \mu_{\mathrm{B}}, \theta=-170 \mathrm{~K}) ). These results are considered in the light of the magnetic susceptibility of (\mathrm{Ba}{2} \operatorname{LaRuO}{6}\left(\mu_{\text {eff }}=4.00 \mu_{B}\right.), (\theta=-304 \mathrm{~K})). 3993 Academic Press. Inc.