- 作者: Ajay Chaudharia*, Harish Chaudharia and Suresh Mehrotrab
- 作者服務機構: Department of Physics, Dr. B. A. M. University, Aurangabad 431 004 (M.S.), India
- 中文摘要: By the use of time domain reflectometry method, dielectric measurements were carried out on dimethylformamide-2-nitrotoluene solvent mixtures in the frequency range 10 MHz-20 GHz, at various temperatures from 15 °C to 45 °C. These solvent mixtures as well as pure solvents display a Debye type dispersion. Their frequency dependent dielectric properties can be summarized by the three parameters in the Debye equation: a static permittivity, permittivity at high frequency and a dielectric relaxation time constant. The free energy of activation for dipolar relaxation process and the Kirkwood correlation factor were determined using these fitting parameters for these solvent mixtures at various concentrations and temperatures. By using these dielectric parameters, the excess permittivity and excess inverse relaxation time is obtained. The excess permittivity is found to be positive for all concentrations and temperatures whereas the excess inverse relaxation time is negative.
- 英文摘要: --
- 中文關鍵字: Static permittivity; Relaxation time; Excess properties; Time domain reflectometry.
- 英文關鍵字: Static permittivity; Relaxation time; Excess properties; Time domain reflectometry.