Dielectric Properties of 1-ethyl-3-methyl-imidazolium Tetrafluoroborate (EMIM-BF4) Using Cole-Cole Relaxation Model
T. J. Ikyumbur *
Department of Physics, Federal College of Education, Pankshin, Plateau State, Nigeria
E. N. Asagha
Department of Physics, Federal College of Education, Obudu, Cross River State, Nigeria
E. C. Hemba
Department of Physics, Federal College of Education, Pankshin, Plateau State, Nigeria
J. A. Bash
Department of Physics, Federal College of Education, Pankshin, Plateau State, Nigeria
*Author to whom correspondence should be addressed.
Abstract
The Cole-Cole relaxation equations were derived from the Debye equation. The dielectric constant E’ and loss factor E” of EMIM-BF4 were fitted using the derived equations at temperature range of 5°C to 65°C and frequency range of 0.1GHz to 10GHz. The result obtained shows that the dielectric constant and loss factor of EMIM-BF4 were higher at low frequency (i.e. f =0.1GHZ and decrease as the frequency increases. The dielectric constant also increases with increase in the temperature except at 0.1GHz. At 15°C there was a sudden increase in the dielectric constant especially as the frequency increases beyond 5GHz. This sudden increase in the dielectric constant of EMIM-BF4 may be due to the phase change of EMIM-BF4. The loss factor of EMIM-BF4 was generally small for all frequencies and temperatures. This may be due to the fact that EMIM-BF4 consumed less energy when subjected to an applied field.
Keywords: Cole-Cole, relaxation, dielectric constant, loss factor, EMIM-BF4