Doped Sr2FeIrO6-Phase Separation and a Jeff ≠ 0 State for Ir5.
Inorg Chem
; 57(16): 10303-10311, 2018 Aug 20.
Article
in En
| MEDLINE
| ID: mdl-30067335
ABSTRACT
High-resolution synchrotron X-ray and neutron powder diffraction data demonstrate that, in contrast to recent reports, Sr2FeIrO6 adopts an I1Ì
symmetry double perovskite structure with an a-b-c- tilting distortion. This distorted structure does not tolerate cation substitution, with low levels of A-site (Ca, Ba, La) or Fe-site (Ga) substitution leading to separation into two phases a stoichiometric I1Ì
phase and a cation-substituted, P21/ n symmetry, a-a-c+ distorted double perovskite phase. Magnetization, neutron diffraction, and 57Fe Mössbauer data show that, in common with Sr2FeIrO6, the cation substituted Sr2- xA xFe1- yGa yIrO6 phases undergo transitions to type-II antiferromagnetically ordered states at TN â¼ 120 K. However, in contrast to stoichiometric Sr2FeIrO6, cation substituted samples exhibit a further magnetic transition at TA â¼ 220 K, which corresponds to the ordering of Jeff ≠ 0 Ir5+ centers in the cation-substituted, P21/ n symmetry, double perovskite phases.
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01-internacional
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MEDLINE
Language:
En
Journal:
Inorg Chem
Year:
2018
Document type:
Article
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