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Structure and magnetic properties of cation-disordered perovskites SrLaCrSnO6 and Ca2CeCr2TiO9

DOI: 10.1016/j.jssc.2018.10.037 DOI Help

Authors: Emily C. Hunter (University of Oxford) , Peter Battle (University of Oxford) , Emmanuelle Suard (Institut Laue-Langevin) , Pascal Manuel (ISIS Facility)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Journal Of Solid State Chemistry

State: Published (Approved)
Published: October 2018
Diamond Proposal Number(s): 13284

Open Access Open Access

Abstract: Polycrystalline samples of the new perovskites SrLaCrSnO6 and Ca2CeCr2TiO9 have been synthesised using the ceramic method and characterized by x-ray diffraction, neutron diffraction and magnetometry. Both crystallise in the space group Pbnm, with a disordered distribution of B-site cations, and both exhibit Gz-type antiferromagnetism at low temperatures. The antiferromagnetic order develops over a large temperature range. It is proposed that isolated antiferromagnetic clusters grow in size upon cooling to form a long-range antiferromagnetically-ordered backbone running through the structure. Cations with few magnetic nearest-neighbours remain decoupled from the backbone down to 2 K. More decoupled clusters are present in Ca2CeCr2TiO9 than in SrLaCrSnO6. This is attributed to the increase in frustration that accompanies the increase in strength of the next-nearest-neighbour interactions that occurs when d1°:Sn4+ is replaced by d°:Ti4+.

Journal Keywords: Cation disorder; Antiferromagnet; Neutron Diffraction; Perovskite

Subject Areas: Chemistry

Instruments: I11-High Resolution Powder Diffraction

Other Facilities: ISIS; Institut Laue-Langevin (ILL)


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