x-ray diffraction; magnetic properties; Mossbauer spectroscopy
Abstract :
[en] Nd18Li8Fe4TiO39 has been synthesised and characterised by neutron powder diffraction, X-ray absorption
spectroscopy, Mossbauer spectroscopy and magnetometry. The cubic structure (Pm3 n,
a=411.97227(8) Å) is based on intersecting <1 1 1> chains comprised of alternating octahedral and
trigonal-prismatic coordination sites. These chains lie within hexagonal-prismatic cavities formed by a
Nd–O framework. The larger of the two crystallographically distinct octahedral sites, 8e, is occupied by
iron, titanium and lithium in a ratio of 76:20:4; the smaller, 2a, is occupied by iron and titanium in a
ratio of 79:21. The trigonal-prismatic site, 16i, is occupied by lithium and iron in a ratio of 98:2. The
cations on the 2a sites are assigned as Ti4+and low-spin Fe4+, and those on the 16i sites as Li+ and
Fe3+. The 8e sites are thought to be occupied by Li+, Fe3+ and Ti3+. Nd18Li8Fe4TiO39 undergoes a
transition to a spin-glass state at 4.25(5) K.
Disciplines :
Chemistry
Author, co-author :
Thammajak, N; University of Oxford > Inorganic Chemistry
Battle, Peter D.; University of Oxford > Inorganic Chemistry
Grandjean, Fernande ; Université de Liège - ULiège > Département de physique > Département de physique
Long, Gary J.; Missouri University of Science and Technology > Chemistry
Ramos, S
Language :
English
Title :
Structural Chemistry and Spin-glass Behaviour of Nd18Li8Fe4TiO39
Alternative titles :
[en] Chimie structurale et comportement de verre de spin de Nd18Li8Fe4TiO39
Publication date :
2012
Journal title :
Journal of Solid State Chemistry
ISSN :
0022-4596
eISSN :
1095-726X
Publisher :
Academic Press, San Diego, United States - California
