Abstract
The effect of thermal treatment atmosphere (argon, air or oxygen) on the electret behavior of bismuth titanate (Bi 4Ti 3O 12) ceramics was investigated. Polycrystalline ferroelectric ceramics were prepared by reactive liquid phase sintering. Sintered samples were polarized applying an electric field, E p = 1 MV m −1 at 100 °C for 60 min. Effective surface density, σ eff of free charges was determined by compensation voltage measurements. Thermally treated samples in oxygen atmosphere exhibit a significant decrease of σ eff while those treated in argon exhibit an increase of σ eff accompanied by the improvement in stability of electret charge. In all cases homocharge with a time independent sign was obtained.
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