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Structural and magnetic properties of Pr18Li8Fe5−xMxO39 (M=Ru, Mn, Co) |
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| Authors: | Siân E Dutton Fernande Grandjean Moulay T Sougrati Emma Winstone |
| Institution: | a Inorganic Chemistry Laboratory, Department of Chemistry, University of Oxford, South Parks Road, Oxford OX1 3QR, UK b Department of Physics, University of Liège, B5, B-4000 Sart-Tilman, Belgium c Department of Chemistry, Missouri University of Science and Technology, University of Missouri-Rolla, Rolla, MO 65409-0010, USA |
| Abstract: | A polycrystalline sample of Pr18Li8Fe4RuO39 has been synthesized by a solid state method and characterized by neutron powder diffraction, magnetometry and Mössbauer spectroscopy; samples of Pr18Li8Fe5−xMnxO39 and Pr18Li8Fe5−xCoxO39 (x=1, 2) have been studied by magnetometry. All these compounds adopt a cubic structure (space group  , a0∼11.97 Å) based on intersecting 〈111〉 chains made up of alternating octahedral and trigonal-prismatic coordination sites. These chains occupy channels within a Pr-O framework. The trigonal-prismatic site in Pr18Li8Fe4RuO39 is occupied by Li+ and high-spin Fe3+. The remaining transition-metal cations occupy the two crystallographically-distinct octahedral sites in a disordered manner. All five compositions adopt a spin-glass-like state at 7 K (Pr18Li8Fe4RuO39) or below. |
| Keywords: | Mixed-metal oxide Magnetism Neutron diffraction Mö ssbauer spectroscopy |
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