Please use this identifier to cite or link to this item:
|Title:||Electrical and optical properties of azo dye|
|Authors:||Aziz, M S|
El-Mallah, H M
|Abstract:||The electrical and optical properties of azo dye (1-phenylazo-2-naphthol) have been investigated. It has been found that the <i>ac</i> conductivity σ<sub>ac</sub>(ω) depends on the temperature and frequency. The <i>ac</i> conductivity as a function of frequency has been described by a power law with the frequency exponent <i>s</i>. The obtained values of <i>s</i> > 1 increase with increasing temperature up to <i>T</i> <373 K and then slightly decrease. The results obtained have been described by the nearly constant loss (NCL) behaviour. The dielectric constant ε<sup>′</sup> and dielectric loss ε' depend on the temperature below elastic temperature <i>T<sub>e</sub></i> and frequency <i>F</i> > 30 kHz and is nearly constant beyond. Both frequency and temperature dependence of the dielectric constant ε' and dielectric loss ε' have been attributed to interfacial and orientational polarization, respectively. The optical constants such as refractive index <i>n</i>, the dispersion energy <i>E</i><sub>d</sub>, the oscillation energy <i>E</i><sub>o</sub>, the room temperature optical dielectric constant Є<sub>L</sub>, the high frequency dielectric constant at infinite wavelength Є<sub>∞</sub> and the ratio of carrier concentration to the effective mass <i>N/m</i>* have been determined using optical spectra. The spectra of refractive index <i>n</i>, exhibit two peaks and two shoulders at energies 1.455, 2.313, 2.731 and 2.385 eV, respectively.|
|ISSN:||0975-1041 (Online); 0019-5596 (Print)|
|Appears in Collections:||IJPAP Vol.47(07) [July 2009]|
Items in NOPR are protected by copyright, with all rights reserved, unless otherwise indicated.