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IJC-A Vol.51A(08) [August 2012] >

Title: Electrical conductivity of cuprous bromide in the temperature range of 30-490 °C
Authors: Singh, Kaman
Yadav, B C
Singh, Vimalesh Kumar
Keywords: Conductivity
Cuprous bromide
Activation energy
Phase transformations
Issue Date: Aug-2012
Publisher: NISCAIR-CSIR, India
Abstract: The electrical conductivity (dc) of solid CuBr has been determined employing the cell configuration Cu/CuBr/Cu over a wide range of temperature (30 – 490 °C) which allowed the phase transformations: -CuBr ↔ β-CuBr and β-CuBr ↔ α-CuBr. With the measured conductivities, activation energy and pre-exponential factors have been evaluated over the studied range of temperature. Transport properties in the respective phases are discussed and compared with those reported in the literature. Though the order of magnitude of observed conductivity is same as that reported in literature, the observed values are higher than those reported earlier. The electrical conductivity of -CuBr increases rapidly with temperature, from 2.51 × 10-3-1 m-1 at 50 °C to 16.08 Ω-1 m-1 at 400 °C. After the first phase transition of -CuBr ↔ β-CuBr, the electrical conductivity attains a value of 148 Ω-1m-1 and increases further with increase in temperature. The conductivity increases by about 30 % on β-phase ↔ α-phase transition (maximum value 377.60 Ω-1m-1 at 487 °C). Activation energies for conduction of -CuBr are found to be 85.58 kJ mol-1 (30-225 °C) and 145.35 kJ mol-1 (320-380 °C) whereas for β-CuBr it is 22.45 kJ mol-1 and for the superionic α-phase it is 2.38 kJ mol-1.
Page(s): 1090-1094
CC License:  CC Attribution-Noncommercial-No Derivative Works 2.5 India
ISSN: 0975-0975(Online); 0376-4710(Print)
Source:IJC-A Vol.51A(08) [August 2012]

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