High Frequency Response and Conduction Mechanism in Thick-Film (Cermet) Resistors
The high frequency response of thick-film (cermet) resistors (TFRs) has been investigated in the range 108-1.8 1010 Hz. The measurements allow us to establish an electrical equivalent circuit for TFRs, whose parameters are directly related to the microstructure of the films. In particular a high effective dielectric constant is obtained which gives information on the mean grain distance in the glassy matrix; the contribution due to grains and barriers to the material resistance is directly evaluated. The barrier resistance Rb has an a.c. component which appears to drop rapidly with frequency, a crude approximation being Rb(ω) ~ 1/ω.
KeywordsGlassy Matrix Electrical Equivalent Circuit High Frequency Response Barrier Resistance Organic Vehicle
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