Magnetic characterization of spinel (original) (raw)

Abstract

Li 1+x Mn 2−x O 4 spinels have been prepared by wet route technique in the whole concentration range 0 ≤ x ≤ 1/3. Structural analysis has been performed by X-ray diffraction and scanning electron microscopy and Raman spectroscopy. The investigation of impurity phases by magnetic experiments complete the sample characterization, allowing for a comparison with samples obtained by other chemical routes. The analysis of the intrinsic magnetic properties show that the magnetic interactions are Mn 3+ -O-Mn 3+ interactions in a geometrically frustrated lattice, while the Mn 4+ -Mn 4+ interactions are negligible, with the consequence that the paramagnetic Curie temperature vanishes in the limit x ≃ 1/3 where only Mn 4+ ions remain. A consistent description of both the extrinsic and the intrinsic properties including former investigations of electron paramagnetic resonance has been achieved in relation to the electrochemical properties.

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