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Title: Polarization/self-depolarization studies on Ag+ ion conducting quenched [0.75AgI:0.25AgCl] mixed system/solid solution
Authors: Agrawal, R C
Gupta, R K
Verma, Mohan L
Sharma, A R
Issue Date: Apr-1999
Publisher: NISCAIR-CSIR, India
Abstract: Temperature dependent dc polarization/self-depolarization studies, on a Ag+ ion conducting system: a quenched [0.75AgI:0.25AgCl] mixed-system/solid-solution, are reported. This system has recently been investigated in the present laboratory as a new and better alternate material in place of conventional host salt AgI. Sample pellets of different thicknesses were sandwiched between graphite (blocking) electrodes and polarized under a constant dc potential (~0.5 V) for different intervals of time. A potential gradient develops across the sample pellet due to accumulation/polarization of mobile Ag+ ions at one end. At the state of complete polarization, the potential measured instantly after the removal of the external dc field has been referred to as peak potential Vp. Vp-values directly indicate the availability of number of mobile Ag+ ions in the system at a particular temperature. Vp-measurements have been carried out as a function of polarization time and temperature in both β and α -like phases of the system. The study revealed that the material attains the state of complete polarization in time t > 5 min, irrespective of the sample thickness. It is also observed that log Vp versus l/T variation, in both β and α- like phases of the material, is almost analogous to log n versus l/T variation, reported earlier for the present system. This, in turn, has reconfirmed one of our assertion made earlier in regards to superionic conduction of α-like phase of the material which is predominantly due to an abrupt increase in n in this phase.
Page(s): 235-238
ISSN: 0975-1041 (Online); 0019-5596 (Print)
Appears in Collections:IJPAP Vol.37(04) [April 1999]

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