Ferrimagnetism as a Consequence of Unusual Cation Ordering in the Perovskite SrLa2FeCoSbO9

Yawei Tang; Emily C Hunter; Peter D Battle; Mylène Hendrickx; Joke Hadermann; J M Cadogan

doi:10.1021/acs.inorgchem.8b01012

Ferrimagnetism as a Consequence of Unusual Cation Ordering in the Perovskite SrLa₂FeCoSbO₉

Inorg Chem. 2018 Jun 18;57(12):7438-7445. doi: 10.1021/acs.inorgchem.8b01012. Epub 2018 May 29.

Authors

Yawei Tang¹, Emily C Hunter¹, Peter D Battle¹, Mylène Hendrickx², Joke Hadermann², J M Cadogan³

Affiliations

¹ Inorganic Chemistry Laboratory , University of Oxford , South Parks Road , Oxford OX1 3QR , U.K.
² EMAT , University of Antwerp , Groenenborgerlaan 171 , 2020 Antwerp , Belgium.
³ School of Physical, Environmental and Mathematical Sciences , UNSW Canberra at the Australian Defence Force Academy , Canberra , BC 2610 , Australia.

PMID: 29808998
DOI: 10.1021/acs.inorgchem.8b01012

Abstract

A polycrystalline sample of SrLa₂FeCoSbO₉ has been prepared in a solid-state reaction and studied by a combination of electron microscopy, magnetometry, Mössbauer spectroscopy, X-ray diffraction, and neutron diffraction. The compound adopts a monoclinic (space group P2₁/ n; a = 5.6218(6), b = 5.6221(6), c = 7.9440(8) Å, β = 90.050(7)° at 300 K) perovskite-like crystal structure with two crystallographically distinct six-coordinate sites. One of these sites is occupied by ²/₃ Co²⁺, ¹/₃ Fe³⁺ and the other by ²/₃ Sb⁵⁺, ¹/₃ Fe³⁺. This pattern of cation ordering results in a transition to a ferrimagnetic phase at 215 K. The magnetic moments on nearest-neighbor, six-coordinate cations align in an antiparallel manner, and the presence of diamagnetic Sb⁵⁺ on only one of the two sites results in a nonzero remanent magnetization of ∼1 μ_B per formula unit at 5 K.