Structural and Magnetic Properties of Pr₁₈Li₈Fe₅₋ₓMnₓO₃₉ (M=Ru, Mn, Co)

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 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.

Department(s)

Chemistry

Keywords and Phrases

Cubic Structure; Metal Cation; Mixed-metal Oxide; Octahedral Sites; Polycrystalline Samples; Prismatic Coordination; Solid State Method; Space Groups; Spin-glass-like State; Ssbauer Spectroscopy; Structural And Magnetic Properties; Magnetic Properties; Magnetism; Magnetometers; Manganese; Manganese Compounds; Metallic Compounds; Molybdenum; Neutron Diffraction; Neutrons; Ruthenium Alloys; Spin Dynamics; Spin Glass; Transition Metals; Ruthenium Compounds; Magnetism; Mössbauer Spectroscopy

International Standard Serial Number (ISSN)

0022-4596

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2009 Elsevier, All rights reserved.

Publication Date

01 Jul 2009

Link to Full Text

Share

 
COinS