Structural, ac conductivity and dielectric properties of 3-formyl chromone

摘要

The structure for the powder of 3-formyl chromone was examined by X-ray diffraction technique in the 20 degrees range (4 degrees-60 degrees).The configuration of Al/3- formyl chromone/Al samples was designed. The electrical and dielectric properties were studied as a function of frequency (42-5x10(6) Hz) and temperature (298-408 K). The ac conductivity data of bulk of 3-formyl chromone varies as a power law with the frequency at different temperatures. The predominant mechanism for ac conduction was deduced. The ac conductivity shows a thermally activated process at different frequencies. The dielectric constant and dielectric loss were determined using the capacitance and dissipation factor measurements at different temperatures. The dielectric loss shows a peak of relaxation time that shifted to higher frequency with an increase in the temperature. The activation energy of the relaxation process was estimated.