Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1298481 | Solid State Ionics | 2005 | 5 Pages |
Abstract
The effect of monovalent and bivalent cations on some electrical properties of 12-tungstophosphoric acid (WPA) salts were studied. The charge carriers in this acid are protonic entities such as H+, OHâ and various forms of hydrated proton H(H2O)+n. Conductivity, dielectric relaxations and activation energies of WPA were investigated. Permittivity measurements were performed on pressed polycrystalline pellets at lower frequencies (5 Hz-500 kHz) and in the X-band microwave range (8-12 GHz); the temperature interval was from room temperature to 360 K. In the microwave region, WPA hexahydrate (WPA-6) and some WPA salts exhibit one, two or three relaxations of the Debye type. Their relaxation times of the order of 10â 11 s are attributed to the fast reorientation of water molecules and/or fast reorientation of oxonium ions (H3O+). In the lower frequency interval, dielectric relaxations of WPA-6 and some WPA salts with longer relaxation times of the order of 10â 7-10â 5 s were registered and assigned to ion (H+ and/or H3O+) and cation jumps.
Related Topics
Physical Sciences and Engineering
Chemistry
Electrochemistry
Authors
M. DavidoviÄ, T. Äajkovski, Ph. Colomban, U.B. MioÄ, V. Likar-SmiljaniÄ, D. Äajkovski, R. BiljiÄ, Z. NediÄ,