FIELD-INDUCED ELECTRON-EMISSION OF CERAMIC AND SINGLE-CRYSTAL BARIUM-TITANATE IN THE VICINITY OF THE PHASE-TRANSITION TEMPERATURES

Investigations of the electron emission of (Ba, Pb)TiO3 ceramics and BaTiO3 single crystals induced by bipolar sinusoidal and rectangular-shaped electric field or de electric field, in the vicinity of their phase transitions, are performed. The differences in the electron emission behaviour between (Ba, Pb)TiO3 ceramics and BaTiO3 single crystals covered with a strip-shaped electrode, on the one hand, and between BaTiO3 crystal samples with free emitting sample surface and emitting surface covered by a comb-shaped electrode, on the other hand, are evidenced. The mechanisms of this electron emission are discussed.