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)

Abstract 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...

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Bibliographic Details
Published in:Chemistry : a European journal 2004-11, Vol.10 (21), p.5473-5480
Main Authors: Arillo, María Angeles, Cuello, Gabriel, López, María Luisa, Pico, Carlos, Veiga, María Luisa
Format: Article
Language:English
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Summary:Abstract 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).
ISSN:0947-6539
1521-3765
DOI:10.1002/chem.200400310