%0 Journal Article
%A Kayser González, Paula
%A Martínez-Lope, Maria Jesus
%A Alonso, Jose Antonio
%A Retuerto, Maria
%A Croft, Marc
%A Ignatov, Alexander
%A Fernández-Díaz, Maria Teresa
%T Crystal Structure, Phase Transitions, and Magnetic Properties of Iridium Perovskites Sr2MIrO6 (M = Ni, Zn)
%D 2013
%@ 0020-1669
%U https://hdl.handle.net/20.500.14352/93620
%X Double perovskites containing Ir6+/Ir5+ with formula Sr2MIrO6 (M = Ni, Zn) have been synthesized under high oxygen pressure conditions. Their crystal structures have been studied by X-ray and neutron powder diffraction at room temperature (RT) and 2 K. At RT, these oxides crystallize in the monoclinic space group P21/n with unit-cell parameters a ≈ √2a0, b ≈ √2a0, and c ≈ 2a0, and β ≈ 90°. The thermal evolution of the structure of the Ni-containing compound shows the presence of two phase transition in the 373–673 K interval following the sequence P21/n → I4/m → Fm3̅m. These materials have also been characterized by magnetic measurements, suggesting the onset of antiferromagnetic interactions at TN = 58 and 46 K, for M = Ni, Zn, respectively. X-ray absorption spectroscopy sheds light on the oxidation states of M and Ir ions within these double perovskites.
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