Normal Poling and High Poling of Ferroelectric Ceramics and Space-Charge Effects

概要

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Poling treatment of field application below Curie point of ferroelectric ceramics is termed "normal poling" and a dc field application above Curie point is termed "high poling". When a high poling is performed for BaTiO_3 or (Sr,Ba)TiO_3, a space-charge polarization (P_2 type) in tire direction of high poling field and an internal bias field E_<-i> with the direction opposite to high poling field are generated. When a ferroelectric sample such as BaTiO_3 and Pb(Zr,Ti)O_3 are aged at temperatures below T_c after normal poling, another space-charge polarization (-P_2 type)in the direction opposite to that of the normal poling and the internal bias field E_i with the same direction as that of normal poling field are generated. In this paper, two kinds of space-charge models in ferroelectric ceramics and related phenomena such as space-charge-stabilized effects on the electromechanical strength, the pseudo-pyroelectric current of high-poled (Sr,Ba)TiO_3 and asymmetric polarization reversal caused by the -P_2 effects will be reviewed and discussed.
社団法人応用物理学会の論文
1993-09-30