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Effect of visible light intensity on the dielectric behaviour of mercuric iodide

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Abstract

The electrical and dielectric properties of mercuric iodide were studied at room temperature under various intensities and colours of light in the frequency range 1 Hz–10 kHz. In the high-frequency region (>40 Hz), the real part of the dielectric constant (ɛ′) is almost constant with frequency (f), colour and intensity of light. At lower frequencies,ɛ′ varies nearly as 1/f and monotonically increases with intensity (I) of the yellow (or green) light, whereas it is almost constant with red light intensity. This behaviour is discussed in the view of the different polarization contributions. The imaginary part of the dielectric constant (ɛ″) was found to vary as 1/f over the frequency range studied. This behaviour was observed whether the crystal was in dark or illuminated implying that the roomtemperature ac dark- or photo-conductivity (σ) is independent of frequency. The observed variation ofσ with intensity of yellow (or green) light was found to follow anI 1/2 dependence and a weaker dependence for the red light. the red light. The conductivity behaviour is discussed in the view of the current theories.

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Authors and Affiliations

  1. Department of Physics, University of Jordan, Amman, Jordan

    M. M. Abdul-Gader, K. A. Wishah, Y. A. Mahmud, M. Al-Haj Abdallah & R. N. Ahmad-Bitar

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  1. M. M. Abdul-Gader
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  2. K. A. Wishah
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  3. Y. A. Mahmud
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  4. M. Al-Haj Abdallah
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  5. R. N. Ahmad-Bitar
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Abdul-Gader, M.M., Wishah, K.A., Mahmud, Y.A. et al. Effect of visible light intensity on the dielectric behaviour of mercuric iodide. Appl. Phys. A 43, 123–130 (1987). https://doi.org/10.1007/BF00617964

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