Crystal Structure and Magnetic Properties of Sm3ReO7

✍ Scribed by G. Wltschek; H. Paulus; I. Svoboda; H. Ehrenberg; H. Fuess

• Publisher: Elsevier Science
• Year: 1996
• Tongue: English
• Weight: 267 KB
• Volume: 125
• Category: Article
• ISSN: 0022-4596
• DOI: 10.1006/jssc.1996.0256

✦ Synopsis

ratio 1.5 : 1. All reactants were intimately mixed in an agate Crystals of a new ternary samarium rhenium oxide, Sm 3 ReO 7 mortar under acetone and sealed into an Pt-10Rh-tube were obtained by subsolidus reaction of samariumsesquioxide with 20 vol% of residual oxygen. The sample was heated and rheniumdioxide (ratio 1.5 : 1) in sealed Pt-10Rh-tubes at in a tube furnace in argon atmosphere with a ramping rate 1673 K. The structure was determined by single-crystal X-ray of 300 K/h to 1673 K for 12 h. Afterward it was cooled down diffraction. Sm 3 ReO 7 crystallizes in the orthorhombic system with 120 K/h to room temperature. Argon atmosphere was with unit cell dimensions a ‫؍‬ 10.736( 5), b ‫؍‬ 7.392(3), and used as a protection measure. c ‫؍‬ 7.519(3) in space group Cmcm (No. 63) with Z ‫؍‬ 4. The On opening the tube a single phase of prismatic dark structure consists of ReO 6 octahedra, distorted SmO 6 octahedra, black crystals was obtained. Most of the crystals had well and SmO 8 prisms that are interconnected to each other to developed faces. The mean diameter of a crystal was as form a three-dimensional network. Rhenium has the formal large as 0.1 to 0.15 mm. The sample itself was checked oxidation state of ؉5 but no metal-metal bond is observed in microscopically (optical and REM) as well as by EDX this compound. The observed magnetization in the temperature range 4 K Ͻ T Ͻ 52 K is explained by a Curie-Weiss law (Sm : Re ratio ϭ 3 : 1) and X-ray examination. The details modified by a temperature independent Van Vleck paramagneof the X-ray single-crystal data collection and structure tism of samarium (3؉).