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Ferrimagnetism as a consequence of cation ordering in the perovskite LaSr2Cr2SbO9

DOI: 10.1016/j.jssc.2017.01.024 DOI Help

Authors: Emily C. Hunter (University of Oxford) , Peter D. Battle (University of Oxford) , Robert Paria Sena (EMAT, University of Antwerp) , Joke Hadermann (EMAT, University of Antwerp)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Journal Of Solid State Chemistry

State: Published (Approved)
Published: January 2017
Diamond Proposal Number(s): 13284

Open Access Open Access

Abstract: A polycrystalline sample of LaSr2Cr2SbO9 has been synthesised using a standard ceramic method and characterized by x-ray and neutron diffraction, magnetometry and electron microscopy. The perovskite-related compound crystallises in the triclinic space group View the MathML sourceI1̅ with unit cell parameters of a = 5.5344(6) Å, b = 5.5562(5) Å, c = 7.8292(7) Å, α = 89.986(12) °, β = 90.350(5) ° and γ = 89.926(9)° at room temperature. The two crystallographically-distinct, six-coordinate cation sites are occupied by Cr3+ and Sb5+ in ratios of 0.868(2):0.132(2) and 0.462(2):0.538(2). Ac and dc magnetometry revealed that LaSr2Cr2SbO9 is ferrimagnetic below 150 K with a magnetisation of ~1.25 µB per formula unit in 50 kOe at 5 K. Neutron diffraction showed that the cations on the two sites order in a G-type arrangement with a mean Cr3+ moment of 2.17(1) µB at 5 K, consistent with a magnetisation of 1.32 µB per formula unit.

Journal Keywords: ferrimagnetism; perovskite; electron microscopy

Subject Areas: Chemistry, Physics

Instruments: I11-High Resolution Powder Diffraction


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