ISSN:
1573-4803
Source:
Springer Online Journal Archives 1860-2000
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Abstract The electrical and dielectric properties of illuminated Hgl2 were studied at room temperature under various a.c.-signal amplitudes in the frequency range 1 Hz to 10 kHz. Below 40 H, We real part of the dielectric constant, ɛ′,was found to vag slightly with voltege for low electric fields (E 〈 103V cm−1, above which it showed a steady increase with the applied voltage. At higher frequencies, no voltage dependence of ɛ′ (or the geometrical capacitance) of the crystal was observed. On the other hand, the imaginary part of the dielectric constant, ɛ″ or the a.c. conductivity, σ (=ωɛoɛ″) was found to decrease considerably with the applied voltage forE 〈 103V cm−1 at all frequencies. For higher fields (E 〉 103V cm−1), σ ∝ exp [C(E/ɛ′)1/2], whereC is e constant. Above 40 Hz, this variation was in good agreement with the behaviour of the bulk, resistance of the crystal. Such behaviour is discussed in the view of Richardnon-Schottky and Poole-Frenkel conduction mechanisms, which seem to be operative in Hgl2 at room temperature.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01132961
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