Electronic properties of beta-vanadium bronzes Li{sub x}Na{sub y}V{sub 2}O{sub 5} (0.23 {le} x + y {le} 0.37) obtained by the sol-gel process

Journal Article · Tue Aug 01 04:00:00 EDT 1995 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1006/jssc.1995.1304· OSTI ID:146447

Pecquenard, B; Badot, J C; Gourier, D ^[1]

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1. Laboratoire de Chimie Appliquee de L`Etat Solide, Paris (France); and others

Vanadium bronzes {beta}-Li{sub x}Na{sub y} V{sub 2}O{sub 5} (0.23 {le} x + y {le} 0.37) have been synthesized by the sol-gel process. These compounds exhibit the monoclinic structure of compounds of the same composition prepared by solid state reaction, but they are obtained as thin layers with a highly preferred orientation. Studies of these compounds by magnetic susceptibility, electron paramagnetic resonance, and electrical conductivity measurements are presented. It is demonstrated from magnetic susceptibility and EPR linewidth that the bipolaron model describes accurately the electronic properties of the lithium and mixed lithium/sodium bronzes synthesized by the sol-gel process. Dc-conductivity measurements between 15 and 300 K show that the bronze conductivities are anisotropic and depend on the nature of the exchanged ion. More complete study on Li{sub 0.23}V{sub 2}O{sub 5}, including ac-conductivity and impedance measurements from 10 Hz to 10 GHz, gives a good correlation between all the experimental techniques described in this paper.

• Sponsoring Organization: USDOE
• OSTI ID: 146447
• Journal Information: Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Journal Issue: 1 Vol. 118; ISSN 0022-4596; ISSN JSSCBI
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ELECTRIC CONDUCTIVITY
ELECTRON SPIN RESONANCE
LITHIUM OXIDES
MAGNETIC SUSCEPTIBILITY
MONOCLINIC LATTICES
PHYSICAL PROPERTIES
SODIUM OXIDES
SOL-GEL PROCESS
STOICHIOMETRY
VANADIUM OXIDES