Structural and magnetic properties of Pr{sub 18}Li{sub 8}Fe{sub 5-x}M{sub x}O{sub 39} (M=Ru, Mn, Co)

Journal Article · Wed Jul 15 00:00:00 EDT 2009 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/j.jssc.2009.04.002· OSTI ID:21370462

Dutton, Sian E ^[1]; Grandjean, Fernande ^[2]; Sougrati, Moulay T ^[2]; Daesdonk, Peter A. van; Winstone, Emma ^[1]

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1. Inorganic Chemistry Laboratory, Department of Chemistry, University of Oxford, South Parks Road, Oxford OX1 3QR (United Kingdom)
2. Department of Physics, University of Liege, B5, B-4000 Sart-Tilman (Belgium)

A polycrystalline sample of Pr{sub 18}Li{sub 8}Fe{sub 4}RuO{sub 39} has been synthesized by a solid state method and characterized by neutron powder diffraction, magnetometry and Moessbauer spectroscopy; samples of Pr{sub 18}Li{sub 8}Fe{sub 5-x}Mn{sub x}O{sub 39} and Pr{sub 18}Li{sub 8}Fe{sub 5-x}Co{sub x}O{sub 39} (x=1, 2) have been studied by magnetometry. All these compounds adopt a cubic structure (space group Pm3-barn, a{sub 0}{approx}11.97 A) 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 Pr{sub 18}Li{sub 8}Fe{sub 4}RuO{sub 39} is occupied by Li{sup +} and high-spin Fe{sup 3+}. 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 (Pr{sub 18}Li{sub 8}Fe{sub 4}RuO{sub 39}) or below. - Graphical abstract: Pr{sub 18}Li{sub 8}Fe{sub 5-x}M{sub x}O{sub 39} (M=Ru, Mn, Co) have been studied by neutron diffraction, Moessbauer spectroscopy and magnetometry, allowing the distribution of the different cation species over the octahedral and trigonal-prismatic coordination sites within the structure to be determined. All the compositions studied undergo a transition to a spin-glass-like phase on cooling below {approx}5 K.

• OSTI ID: 21370462
• Journal Information: Journal of Solid State Chemistry, Vol. 182, Issue 7; Other Information: DOI: 10.1016/j.jssc.2009.04.002; PII: S0022-4596(09)00148-0; Copyright (c) 2009 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; ISSN 0022-4596
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CATIONS
COBALT COMPOUNDS
CUBIC LATTICES
IRON COMPOUNDS
IRON IONS
LITHIUM COMPOUNDS
LITHIUM IONS
MAGNETIC PROPERTIES
MANGANESE COMPOUNDS
MOESSBAUER EFFECT
NEUTRON DIFFRACTION
OXIDES
POLYCRYSTALS
PRASEODYMIUM COMPOUNDS
RUTHENIUM COMPOUNDS
SPACE GROUPS
SPIN GLASS STATE
TEMPERATURE RANGE 0000-0013 K
ALKALI METAL COMPOUNDS
CHALCOGENIDES
CHARGED PARTICLES
COHERENT SCATTERING
CRYSTAL LATTICES
CRYSTAL STRUCTURE
CRYSTALS
DIFFRACTION
IONS
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
RARE EARTH COMPOUNDS
REFRACTORY METAL COMPOUNDS
SCATTERING
SYMMETRY GROUPS
TEMPERATURE RANGE
TRANSITION ELEMENT COMPOUNDS