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      Permanent link:
      https://www.ias.ac.in/article/fulltext/pram/068/05/0851-0861

    • Keywords

       

      Time domain reflectometry; formamide; dimethylaminoethanol; excess parameters; Kirkwood correlation factor; Bruggeman factor; activation energy

    • Abstract

       

      Dielectric relaxation measurements of formamide (FMD)–$N,N$- dimethylaminoethanol (DMAE) solvent mixtures have been carried out over the entire concentration range using time domain reflectometry technique at 25, 35 and 45° C in thefrequency 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 $\epsilon^{∗}(\omega)$ from complex reflection coefficient $\rho^{∗} (\omega)$ over the frequency range of 10 MHz to 10 GHz. The excess permittivity ($\epsilon^{E}$), excessinverse relaxation time $(1/\tau)^{E}$, Kirkwood correlation factor ($g^{eff}$), activation energy and Bruggeman factor ($f_{B}$) are also calculated to study the solute–solvent interaction.

    • Author Affiliations

       

      Prabhakar Undre1 S N Helambe2 S B Jagadale2 P W Khirade1 S C Mehrotra3

      1. Microwave Research Lab, Department of Physics, Dr. B.A.M. University, Aurangabad 431 004, India
      2. Microwave Research Lab, Department of Physics, Deogiri College, Aurangabad 431 005, India
      3. Department of Computer Science and Electronics, Dr. B.A.M. University, Aurangabad 431 004, India
    • Dates

       
  • Pramana – Journal of Physics | News

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