Abstract
Ferroelectric nitrogen-doped Bi4Ti3O12 (BIT) and nitrogen-substituted BIT (N-BIT) thin films are prepared by an radiofrequency-magnetron-sputtering method such that nitrogen atoms are incorporated into oxygen sites. The remnant polarization Pr and the coercive field Ec of the nitrogen-doped BIT are enhanced relative to those of the undoped BIT (Figure). The leakage current of the nitrogen-doped BIT decreases and the fatigue properties improves compared to the undoped BIT.
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