Structural and Magnetic Properties of Pr₁₈Li₈Fe₅₋ₓMₓO₃₉ (M=Ru, Mn, Co)
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-xMnxO 39 and Pr18Li8Fe5-xCoxO 39 (x=1, 2) have been studied by magnetometry. All these compounds adopt a cubic structure (space group Pm over(3, -) n, 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. © 2009 Elsevier Inc. All rights reserved.
S. E. Dutton et al., "Structural and Magnetic Properties of Pr₁₈Li₈Fe₅₋ₓMₓO₃₉ (M=Ru, Mn, Co)," Journal of Solid State Chemistry, Elsevier, Jan 2009.
The definitive version is available at http://dx.doi.org/10.1016/j.jssc.2009.04.002
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© 2009 Elsevier, All rights reserved.