Dielectric relaxation measurements of formamide (FMD)-N ,Ndimethylaminoethanol (DMAE) solvent mixtures have been carried out over the entire concentration range using time domain reflectometry technique at 25, 35 and 45 • C in the frequency range of 10 MHz to 20 GHz. The mixtures exhibit a principle dispersion of the Davidson-Cole relaxation type at microwave frequencies.Bilinear calibration method is used to obtain complex permittivity ε * (ω) from complex reflection coefficient ρ * (ω) over the frequency range of 10 MHz to 10 GHz. The excess permittivity (ε E ), excess inverse relaxation time (1/τ ) E , Kirkwood correlation factor (g eff ), activation energy and Bruggeman factor (fB) are also calculated to study the solute-solvent interaction.

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Dielectric relaxation measurements on formamide (FA) -ethanolamine (ETA) solvent mixtures have been carried out across the entire concentration range using time domain reflectometry technique at 15, 25, 35, and 45• C over the frequency range from 10 MHz to 10 GHz. The mixtures exhibit a principle dispersion of the Davidson-Cole relaxation type at microwave frequencies. Bilinear calibration method is used to obtain complex permittivity ε * (ω) from complex reflection coefficient ρ * (ω) over the frequency range 10 MHz to 10 GHz. The excess permittivity ε E , excess inverse relaxation time (1/τ ) E , Kirkwood correlation factor g eff , and thermodynamic parameters such as Gibbs energy of activation ∆G and molar enthalpy of activation ∆H are also calculated to study the solute-solvent interaction.