Premium
Crystal and Magnetic Structure of Sr 2 BIrO 6 (B = Sc, Ti, Fe, Co, In) in the Framework of Multivalent Iridium Double Perovskites
Author(s) -
Kayser Paula,
Alonso Jose A.,
Mompeán Federico J.,
Retuerto Maria,
Croft Mark,
Ignatov Alexander,
FernándezDíaz Maria T.
Publication year - 2015
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.201500569
Subject(s) - chemistry , iridium , orthorhombic crystal system , crystallography , crystal structure , monoclinic crystal system , antiferromagnetism , neutron diffraction , magnetic moment , perovskite (structure) , context (archaeology) , paramagnetism , condensed matter physics , physics , paleontology , biochemistry , biology , catalysis
The preparation, crystal structure and magnetic properties of Sr 2 BIrO 6 (B = In, Sc, Fe, Co or Ti) oxides are reported. For B = Sc, Fe, Co or In materials, X‐ray and neutron powder diffraction (NPD) studies confirm the presence of 1:1 B‐ordered perovskite‐like structures crystallizing in the monoclinic I 2/ m and P 2 1 / n space groups, with unit‐cell parameters a ≈ √2 a 0 , b ≈ √2 a 0 , c ≈ 2 a 0 and β ≈ 90°. Sr 2 TiIrO 6 is described as a disordered perovskite with orthorhombic symmetry in the Pbnm space group. For B = Fe and Co, low‐temperature NPD data and magnetic measurements indicate the existence of an antiferromagnetic structure resulting from the Fe 3+ /Co 3+ magnetic moment interaction. X‐ray absorption spectroscopy corroborates that the oxidation states of B and Ir are 3+ and 5+, respectively. The bond lengths and other structural features are discussed in the framework of other recently reported iridium double perovskites where iridium adopts tetravalent, pentavalent and hexavalent oxidation states, and in the wider context of Sr double perovskites.