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Crystal and Magnetic Structure of the System Li 0.5+0.5 x Fe 2.5−1.5 x Ti x O 4 ( x =0.16, 0.44, and 0.72)
Author(s) -
Arillo María Angeles,
Cuello Gabriel,
López María Luisa,
Pico Carlos,
Veiga María Luisa
Publication year - 2004
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.200400310
Subject(s) - ferrimagnetism , neutron diffraction , crystal structure , materials science , rietveld refinement , crystallography , magnetic structure , titanium , diffraction , lithium (medication) , ferrite (magnet) , stoichiometry , phase (matter) , analytical chemistry (journal) , magnetization , chemistry , physics , metallurgy , magnetic field , optics , medicine , organic chemistry , chromatography , quantum mechanics , composite material , endocrinology
The influence of thermal treatment on the structure of lithium titanium ferrite spinels of general formula Li 0.5+0.5x Fe 2.5−1.5x Ti x O 4 ( x =0.16, 0.44, and 0.72) has been studied by X‐ray and neutron diffraction and analysed by the Rietveld method. The results allow us to conclude the presence of an ordered phase (space group P 4 3 32) at room temperature for the sample with x =0.16; this phase does not appear for the remaining compositions. The magnetic properties evidence a ferrimagnetic ordering in the structures when a random cation distribution (space group Fd 3 m ) is obtained. An exhaustive study carried out by neutron diffraction measurements on these samples shows a different behaviour when the titanium content is increased, concluding that the lower substituted phase ( x= 0.16) exhibits a Néel's collinear ferrimagnetic structure, with the higher substituted structures being noncollinear ( x =0.44 and 0.72).