Polarization and fluctuation characteristics of tantalum solid electrolyte capacitors

Abstract

A new method of tantalum capacitor testing and reliability prediction is presented based on the analysis of polarization mechanisms and noise characteristics. Polarization mechanisms of the Ta2O5 dielectric layer include electron polarization, fast ion polarization and ion relaxation polarization. Impurities usually add a fourth polarization type, migration polarization, which is effective in the mHz–kHz frequency region. © 1998 John Wiley & Sons, Ltd.

The Impact of Ionic Species on Wet Leakage Current of Conductive Polymer Coated Tantalum Dielectric

“…This hypothesis is consistent with findings documented in high voltage conductive polymer tantalum capacitor development. 10 In order to further clarify the cationic effects, wet LC was measured in 0.05 M ferric sulfate (Fe 2 (SO 4 ) 3 ) and 0.05 M ferrous sulfate (FeSO 4 ) solutions, thereby eliminating any anion influences in the experiments. The LC values of anodized and conductive polymer coated anodes are shown in Figs.…”