Charge retention characteristics of (Bi,La)4Ti3O12 capacitors : Comparison with Pb(Zr,Ti)O3 capacitors

We investigated the retention characteristics of (Bi,La)4Ti3O12 (BLT) capacitors with Pt electrodes and compared them with Pb(Zr,Ti)O3 (PZT) capacitors in the same- and opposite-state retentions. Polarization relaxations in short-time regime (t < 100 s) were well described by a power-law decay function, but the polarization relaxation of BLT was more signicant than that of PZT. We discuss the dierence in the relaxation process of polarization in conjunction with lm microstructures and magnitudes of polarization for BLT and PZT. In long-time opposite-state retention, BLT capacitors showed much better characteristics than PZT. For both BLT and PZT, the opposite-state retention loss was governed by the development of an internal eld during retention. For BLT capacitors, internal eld development was much weaker than for PZT after retention, resulting in a good opposite-state retention. Structural and electrical properties are discussed in conjunction with the retention haracteristics of the materials. KCI Citation Count: 12