Ferroelectric and piezoelectric response in (100)-oriented Mn-doped Bi0.5Na0.5TiO3-BaTiO3 thin films

摘要

In this work, high-quality Mn-doped 0.935Bi(0.5)Na(0.5)TiO(3)-0.065BaTiO(3) (Mn-BNBT) ferroelectric film was prepared on the SrRuO3-buffered (100)-oriented SrTiO3 single-crystal substrate using pulsed laser deposition method. The phase structure, morphology, domain and electrical properties were studied. Large remnant polarization P-r up to 35 mu C/cm(2), moderate dielectric constant e33T/e(0) of 800 and low dielectric loss tan delta of 0.037 at 1 kHz was obtained at room temperature along with excellent local piezoelectric response. The temperature dependence of the ferroelectric hysteresis loop measurements indicates the ferroelectric long-range order can be sustain as high as 150 degrees C. The excellent global properties make the present Mn-BNBT thin film quite potential in environmental-friendly piezoelectric integrated device applications.