Preparation, Crystal Structure, and Magnetic Studies of a New Sr7Re4O19 Double Oxide and Its Relation to the Structure of Ba7Ir6O19

✍ Scribed by K.G. Bramnik; H. Ehrenberg; H. Fuess

• Publisher: Elsevier Science
• Year: 2001
• Tongue: English
• Weight: 390 KB
• Volume: 160
• Category: Article
• ISSN: 0022-4596
• DOI: 10.1006/jssc.2001.9182

✦ Synopsis

The complex oxide Sr 7 Re 4 O 19 has been synthesized and its crystal structure was determined by X-ray di4raction powder data analysis (space group C2/m; a ‫؍‬ 13.6379(3) A > , b ‫؍‬ 5.6035(2) A > , c ‫؍‬ 10.3700(3) A > ;

‫؍‬ 98.348(2)3, Z ‫؍‬ 2, R I ‫؍‬ 0.018, R P ‫؍‬ 0.050). The compound crystallizes in a new structure type, which can be derived from the Ba 7 Ir 6 O 19 structure by removing the Ir atoms from the middle octahedron of three face-sharing IrO 6 octahedra units. This change results in the in5nite cis-bridged chains of the ReO 6 octahedra linked together by common corners. Each chain is connected with another one by the corner-sharing of each second ReO 6 octahedron. The 10-and 12-coordinated Sr atoms are situated between these in5nite structure fragments. Magnetic properties of the Sr 7 Re 4 O 19 compound were studied by SQUID measurements.