[en] A polycrystalline sample of Pr18Li8Fe4RuO39 has been synthesized by a solid state method and characterized by neutron powder diffraction, magnetometry and Mossbauer spectroscopy; samples of Pr18Li8Fe5-xMxO39 and Pr18Li8Fe5-xCoxO39 (x = 1, 2) have been studied by magnetometry. All these Compounds adopt a cubic structure (space group Pm (3) over barn, a(o)similar to 11.97 angstrom) 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. (C) 2009 Elsevier Inc. All rights reserved.
Disciplines :
Chemistry
Author, co-author :
Dutton, Sian E
Battle, Peter D
Grandjean, Fernande ; Université de Liège - ULiège > Département de physique > Département de physique
Long, Gary J
Sougrati, Moulay Tahar ; Université de Liège - ULiège > Département de physique > Département de physique
van Daesdonk, Peter A
Winstone, Emma
Language :
English
Title :
Structural and magnetic properties of Pr18Li8Fe5-xMxO39 (M = Ru, Mn, Co)
Publication date :
2009
Journal title :
Journal of Solid State Chemistry
ISSN :
0022-4596
eISSN :
1095-726X
Publisher :
Academic Press, San Diego, United States - California