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E-Journal of Chemistry
Volume 8, Issue 3, Pages 1378-1386

Microwave Dielectric Study of Tetramethylurea and N, N-Dimethylacetamide Binary Mixture in Benzene

V. Sharma1 and N. Thakur2

1Department of Physics, National Institute of Technology, Hamirpur, Himachal Pradesh, India
2Department of Physics, H. P. University, Shimla, India

Received 23 September 2010; Accepted 27 November 2010

Copyright © 2011 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Dielectric relaxation of the binary mixture of tetramethylurea and N, N-dimethylacetamide has been studied at fixed frequency and temperature (9.88 GHz & 298 K respectively) in benzene solution. Different dielectric parameters like the dielectric constant (ε') and the dielectric loss (ε") at microwave frequency, static dielectric constant (ε0) and dielectric constant (ε) at optical frequency were determined. The values of relaxation time (τ(1), τ(2), τ(0) & τGK) have been calculated using higasi’s single frequency method and Gopala Krishna’s method. Using Eyring’s rate theory, the activation energies for the process of dielectric relaxation and viscous flow were calculated and compared. The study of dielectric properties of the binary mixture reveals the existence of the solute-solute type of molecular associations.