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1 2006

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Preparation and Some Properties of Lithium Vanadium Bronzes

El-Sayed A., Mousa S.

Polish Journal of Chemistry

2006

Vol. 80, nr 5

773-781

Lithium vanadium bronzes with composition formula LixV2O5 (0.04 _ x _ 0.92) have been prepared by solid-state reaction at 650graduate C in argon atmosphere. The obtained products were characterized by X-ray powder diffraction and IR spectroscopy. The results reveal that four phases are present in the range from x = 0.04 to 0.92 namely alfa,beta ,beta' , and gamma phase. The magnetic susceptibility for the investigated samples was measured using the conventionalGouy'smethod. The effectivemagnetic moments as calculated from experimental data indicate the presence ofV4+ ions in all samples. The electrical conductivity as a function of temperature and lithium content was measured from room temperature to 483 K. The electrical conductivity of the samples is found to be affected by lithium content. The electrical conductivity increases with temperature and both electronic and ionic conduction are discussed.