Effects of iron substitution and anti-site disorder on crystal structures, vibrational, optical and magnetic properties of double perovskites Sr2(Fe1−xNix)TeO6
Asmaa Zaraq, Duncan H. Gregory, Brahim Orayech, Josu M. Igartua, Abdeslam El Bouari, James D. Eales, Paul A. Bingham and Thorsten M. Gesing Dalton Transactions (2022) https://doi.org/10.1039/D2DT02447K [...] monoclinic space group I 2/ m . The double-perovskite structures ideally contain two alternating types of octahedra (Fe/Ni) 2 d O 6 and (Te) 2 a O 6 , tilted in the system (a − a − c 0 ). However, the refinements [...] room temperature of samples with compositions x = 0, 0.25, 0.50 and 0.75 reveal the presence of Fe 3+ in high-spin state with an anti-site disorder of Fe–Ni–Te cations in distorted octahedral environments