Noise generation in crystals and in ceramic forms of barium titanate when subjected to electric stress

The paper describes an investigation of the noise generated in crystals and in ceramic forms of barium titanate when subjected to electric stress, as a function of the stress and of temperature above and below the Curie point of the material. The primary purpose of the work was to establish the existence of a ferro-electric Barkhausen effect associated with the domain structure. The results obtained on crystals have permitted an estimate of the effective volume of the individual domains, and this is compared with a previously published value. The ceramic specimens exhibited considerable additional noise of different origin. The characteristics of this noise have been studied, but its satisfactory elucidation will require much further investigation.