Transient ionic current measurement of ionic mobilities in a few proton conductors

Structural Aspects and Ion Transport Properties of a New Mixed System BiI3 - Ag2WO4

“…The absorption band noticed around 732±3 cm -1 in all the samples is similar to the absorption band at 735 cm -1 reported for minerals of russelite structure, classified as one of the complex oxides in which an anionic WO 4 2-group is bonded to bismuth as the cation. The observed absorption bands around 456±3 cm -1 in the case of the nine different compositions may be ascribed to γ 2 stretching mode of octahedral WO 6 6-ions 16,17 . Similarly the absorption band appearing at 623±3 cm -1 for the compositions with y varying from 10 to 50 mol% BiI 3 are assigned to the vibrational frequency of γ 3 stretching mode of WO 6 6-ions 16,17 .…”

“…The observed absorption bands around 456±3 cm -1 in the case of the nine different compositions may be ascribed to γ 2 stretching mode of octahedral WO 6 6-ions 16,17 . Similarly the absorption band appearing at 623±3 cm -1 for the compositions with y varying from 10 to 50 mol% BiI 3 are assigned to the vibrational frequency of γ 3 stretching mode of WO 6 6-ions 16,17 . Thus FT-IR data of the present mixed system (BiI 3 ) y -(Ag 2 WO 4 ) 100-y (10 ≤ y ≤ 90) suggest the formation of polyanions such as tetrahedral WO 4 2-ions and octahedral WO 6 6-ions units may characterize the oxyanion framework in these samples 18 .…”

“…The ionic transport studies were carried out for all the samples within the present system by Wagner's polarization technique 6 wherein a polarization cell was made in the form of a pellet from the powdered sample forming the electrolytic phase sandwiched between a non-blocking electrode consisting of a mixture of silver metal powder and electrolyte and an ion blocking electrode, carbon. On the application of a small dc potential (~200 mV) across the cell with polarity (-) (Ag, electrolyte) / electrolyte / carbon (+), the current and potential difference are noted simultaneously as a function of time using a Keithley model 6157A electrometer.…”

Ion transport behavior in a new fast Ag+ ion conducting composite electrolyte system: 0.85[0.75AgI:0.25AgCl]:0.15CeO2

“…[7][8][9][10][11] are suggested for two-phase composite electrolyte system, the reason for the enhancement in the room temperature conductivity with the effect of soaking time is due to increase/decrease in mobile ion concentration or increase/decrease in ionic mobility as a result of creation of high conducting paths interconnecting the different two-phase boundaries [2][3][4]. To find out valid reason for the conductivity enhancement in this system, we carried out direct measurement of ionic mobility (l), using transient ionic current (TIC) technique [22]. In this technique the sample sandwiched between two blocking electrodes as shown below…”

Modeling of Ag+ mobility in AgI by space charge depolarization process

“…Consequently, carrier concentration is computed by using conductivity and mobility. A formula used for the direct determination of ionic mobility [3,4] is…”