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Preparation and Some Properties of Lithium Vanadium Bronzes
Author(s) -
ElSayed Ahmed Mohamed,
Mousa Sahar Mohamed Ahmed
Publication year - 2006
Publication title -
journal of the chinese chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.329
H-Index - 45
eISSN - 2192-6549
pISSN - 0009-4536
DOI - 10.1002/jccs.200600073
Subject(s) - chemistry , vanadium , lithium (medication) , electrical resistivity and conductivity , analytical chemistry (journal) , atmospheric temperature range , magnetic susceptibility , conductivity , argon , bronze , powder diffraction , ionic conductivity , inorganic chemistry , metallurgy , electrode , crystallography , thermodynamics , materials science , medicine , physics , engineering , chromatography , organic chemistry , electrolyte , electrical engineering , endocrinology
Lithium vanadium bronzes with composition formula Li x V 2 O 5 (0.04 ≤ × ≤ 0.92) have been prepared by solid‐state reaction at 650 °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 α, β, β′, and γ phase. The magnetic susceptibility for the investigated bronzes was measured using the conventional Gouy's method. The values of the effective magnetic moments, as calculated from experimental data, indicate the presence of V 4+ ions in all bronze samples. The electrical conductivity as a function of temperature and lithium content was measured in the temperature range from room temperature to 483 K. The electrical conductivity of the bronzes is found to be affected by lithium content. The values of the electrical conductivity increase with temperature for the prepared samples and both electronic and ionic conduction are discussed.