Crystal structure, phase transitions, and magnetic properties of iridium perovskites Sr2MIrO6 (M = Ni, Zn).
Inorg Chem
; 52(19): 11013-22, 2013 Oct 07.
Article
en En
| MEDLINE
| ID: mdl-24028450
ABSTRACT
Double perovskites containing Ir(6+)/Ir(5+) 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 P2(1)/n with unit-cell parameters a ≈ â2a0, b ≈ â2a0, and c ≈ 2a0, and ß ≈ 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 P2(1)/n â I4/m â Fm3m. These materials have also been characterized by magnetic measurements, suggesting the onset of antiferromagnetic interactions at T(N) = 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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01-internacional
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MEDLINE
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En
Revista:
Inorg Chem
Año:
2013
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Article
País de afiliación:
España