Abstract
The AC electrical properties of thin evaporated films of cerous fluoride have been extensively investigated to determine the dominant conduction or loss mechanism within the frequency range 100 Hz to 20 kHz. A single relaxation effect was observed within this audiofrequency band. With the aid of a modified theory, developed from the classical Debye relaxation equations, it was shown that the relaxation was a true dielectric phenomenon resulting from the orientation of dipoles. The relaxation process was found to have an activation energy of 0·80±0·06 eV and an averaged relaxation time of 1·5×10−3 s. The dipoles were shown to arise from a fluorine deficiency within the film and to have a concentration of 1026 m−3. The relaxation process was characterized by a distribution function which was shown to be dependent on substrate temperature during sample fabrication and on thickness. The microscopic nature of the dipoles is discussed.
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