Abstract :
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.
