ISSN:
1432-0630
Keywords:
Conduction
;
Dielectric dispersion
Source:
Springer Online Journal Archives 1860-2000
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
,
Physics
Notes:
Abstract Transport and dielectric properties of polycrystalline CoO films were studied as functions of the applied field, frequency and temperature. TheI–V plots showed that the Poole-Frenkel field emission mechanism is responsible for conduction at fields〉105 V/cm. The ac conductivity σ(ω), the imaginary part of the dielectric constantε 2, and tan δ plots as functions of frequency revealed three dispersion regions. The σ(ω) andε 2 frequency dependence indicates a non-adiabatic hopping of charge carriers at low frequencies and adiabatic hopping at high frequencies. The activation energy of a dielectric oscillator is 0.15 eV.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00928224
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