Structural and magnetic properties of Pr18Li8Fe5-xMxO39 (M = Ru, Mn, Co)

Journal article

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.

Authors: Dutton, SE; Battle, P; Grandjean, F; Long, G; Sougrati, M

• Publication status: Published
• Journal: JOURNAL OF SOLID STATE CHEMISTRY
• Volume: 182
• Issue: 7
• Pages: 1638-1648
• Publication date: 2009-07-01
• DOI: 10.1016/j.jssc.2009.04.002
• EISSN: 1095-726X
• ISSN: 0022-4596
• Language: English
• Keywords: Magnetism; Mossbauer spectroscopy; Neutron diffraction; Mixed-metal oxide