Low-temperature structure and magnetic properties of the spinel LiMn{sub 2}O{sub 4}: A frustrated antiferromagnet and cathode material
- McMaster Univ., Hamilton, Ontario (Canada). Brockhouse Inst. for Materials Research
LiMn{sub 2}O{sub 4} has found important applications as a cathode material in secondary lithium ion batteries. Despite the intense interest in this material by the electrochemical community there exist few reported studies of the interesting structural and magnetic phase transitions. Powder neutron diffraction has been used to study the nature of the structural transition away from the cubic structure upon cooling below {approximately}285 K in the spinel LiMn{sub 2}O{sub 4}. The authors report powder data taken between 10 K and 333 K and propose a large cell tetragonal structure in space group for the material at 100 K. While complete segregation of the Mn{sup 3+} and Mn{sup 4+} ions is not possible in this space group, bond-valence analysis indicates that the distribution of Mn{sup 3+} and Mn{sup 4+} ions is not random and that there is a degree of charge segregation. Further, LiMn{sub 2}O{sub 4} is also of interest because it is an example of a geometrically frustrated antiferromagnet. The large size and implied complexity of the magnetic structure is consistent with both charge segregation and significant further neighbor exchange interactions.
- OSTI ID:
- 682133
- Journal Information:
- Chemistry of Materials, Vol. 11, Issue 6; Other Information: PBD: Jun 1999
- Country of Publication:
- United States
- Language:
- English
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