Structural Chemistry and Electronic Properties of Sr2FeIrO6

✍ Scribed by P.D Battle; G.R Blake; T.C Gibb; J.F Vente

• Publisher: Elsevier Science
• Year: 1999
• Tongue: English
• Weight: 239 KB
• Volume: 145
• Category: Article
• ISSN: 0022-4596
• DOI: 10.1006/jssc.1999.8201

✦ Synopsis

A polycrystalline sample of Sr 2 FeIrO 6 has been synthesized and shown by a combination of X-ray di4raction, neutron di4raction, magnetometry, and MoK ssbauer spectroscopy to be a triclinic (space group I1 ; a : 5.54996(3) A s , b : 5.57847(3) A s , c : 7.84165(3) A s , : 89.990(1)3, : 90.059(1)3, : 90.079(1)3) perovskite, with a partially ordered (0.928 : 0.072(4)) distribution of transition metal cations over the six-coordinate sites. The predominant oxidation states are Fe 3؉ and Ir 5؉ , although the MoK ssbauer data suggest that &4% Fe 4؉ is present. The compound is a Type II antiferromagnet below 120 K, with an ordered magnetic moment on the Fe-dominated sites of 3.67(3) B per Fe 3؉ cation. The spins associated with the antisite defects are frustrated and do not take part in the long-range magnetic ordering, consequently giving rise to hysteresis in the magnetic susceptibility below 40 K. The possible location of the Fe 4؉ cations is discussed brie6y.