Influence of the Cation Distribution on the Physical Properties of the Diluted Magnetics Li_1.33Ti_1.67O₄/Co₂TiO₄

Abstract:

Spinel samples of Li_1.33xCo_2-2xTi_1+0.67xO₄ crystallize in two space groups: Fd- 3 m for 0≤x≤0.40 and x=1, and P4₃32 for 0.50≤x≤0.875. In S.G. P4₃32 magnetic Co²⁺ ions occupy 8c sites (for x=0.75 and 0.875), or 8c, 4b and 12d sites (for x=0.50). In x=0.25 and 0.40 samples Co²⁺ occupy both 8a and 16d cation sites of the S.G. Fd- 3 m [1]. Observed differences in magnetic behaviour of the samples are induced by crystallographic distribution of Co²⁺. Possible paths for exchange interactions in S.G. P4₃32 were analysed. It was found that the superexchange is the dominant exchange mechanism where Co²⁺ (8c)-O(24e)-Co²⁺(12d) path was the most important one. On the basis of the results on crystallographic distribution we suggest x=0.50 sample as potential electrode material in Li ion rechargeable batteries.

• Periodical: Materials Science Forum (Volumes 443-444)
• Pages: 371-374
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.443-444.371
• Online since: January 2004
• Authors: B. Antić, Jovan Blanuša, N. Jovic, V. Kusigerski, A. Kremenović
• Keywords: Cation Distribution, Physical Properties, Spinel, Superexchange

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