Phase Transition in a [Ag₂HgI₄:0.2AgI] Mixed Composite System
Doped with KI¹

Noorussaba^z and Afaq Ahmad

Solid State Chemistry Lab., Department of Chemistry Aligarh Muslim University, Aligarh-202002, India

Received August 30, 2010

Abstract—A novel mixed composite system, [Ag₂HgI₄:0.2AgI]:xKI, (x = 0.2, 0.4, 0.6 mol %), was prepared
and [Ag₂HgI₄:0.2AgI] composite system was used as the host. Electrical conductivity was measured to study
the transition behavior at frequencies of 100, 120 Hz, 1, and 10 kHz in the temperature range of 90–170C. Con-
ductivity increased sharply during the – phase transition. Upon increasing the dopant-to-host ratio, the con-
ductivity of the superionic system exhibited Arrhenius (thermally activated)-type behavior. X-ray powder dif-
fraction, DTA, DTG and TGA were performed to confirm the doping effect and transition in the host. The phase
transition temperature decreased with an increase in the dopant concentration. Activation energies in eV for pre-
and post-transition phase behavior are also reported.

Keywords: silver ion conductor, composite electrolytes, chemical synthesis, electrical conductivity, phase tran-
sition, X-ray powder diffraction, differential thermal analysis, differential thermo-gravimetry, thermo-gravi-
metric analysis, doping effect etc.

DOI: 10.1134/S1023193512080125

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