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Indian Journal of Chemistry -Section A (IJC-A) >
IJC-A Vol.51A [2012] >
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 Ω-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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