REMANENT POLARIZATION IN THE LAYERED PEROVAKITE-LIKE FERROELECTRIC La_4Ti_3(Sc,Nb)O_14

摘要

Poking La4Ti_3(Sc,Nb)O_14 ceramics at elevated temperatures ensures a relatively high initial surface potential of the electret, which tends to rise in repeat poling cycles. The electret state thus produced combines a high temporal stability, in particular, at elevated temperatures, and a good thermal stability of the surface potential .The advantageous electret properties of the La_4Ti_3(Sc,Nb)O_14 ceramics are presumably associated with the contribution of ion migration during poling to the remanent polarization ,resulting from the increase in the fraction of Sc~3+ ions residing at the boundaries of the perovskite layers