Evolution of microscopic domain structure and macroscopic properties of (1-x)(Bi0.5Na0.5)TiO3-xBaTiO3 ceramic coatings.

Sodium bismuth titanate-based ferroelectric materials have a promising application in modern microdevices due to their strong ferroelectricity and high Curie temperature. The domain structure plays a crucial role in the piezoelectric and ferroelectric properties of (1- x)(Bi 0.5 Na 0.5)TiO 3 - x BaTiO 3 ((1- x)BNT- x BT)(x =0, 0.06, 0.08, 0.10) ceramic coatings. In this paper, (1- x)BNT- x BT ceramic coatings were prepared by supersonic plasma spraying. Piezoresponse-force microscopy (PFM) was employed to gain insight into the microscopic domain evolution of (1- x)BNT- x BT ceramic coatings. Piezoelectric-force Microscopy (PFM) results show that the 0.92BNT-0.08BT ceramic coating exhibits relatively homogeneous striped domains and island domains, as well as a maximum amplitude response with an average amplitude intensity of 67.6 pm, which increases the localized piezoelectric response of the ceramic coating. The switching spectroscopy piezoelectric-force microscopy (SS-PFM) results show that the local piezoelectric coefficient (PR max) of the 0.92BNT-0.08BT ceramic coating reaches 426.5 pm/V at 15 V, and the ferroelectric domains exhibit significant switching behavior. This study provides new ideas to further understand the relationship between microscopic electrical domains and macroscopic properties of these important lead-free piezoelectric ceramics. ● (1- x)(Bi 0.5 Na 0.5)TiO 3 - x BaTiO 3 ceramic coatings were prepared by supersonic plasma spraying. ● When x =0.08, the remnant polarization (P r) of the 0.92BNT-0.08BT ceramic coating reaches 28.9 μC/cm2, the coercive field (E c) is 30.6 kV/cm, and T m is 425.2 ℃. ● The 0.92BNT-0.08BT ceramic coating exhibits relatively homogeneous striped domains and island domains, as well as a maximum amplitude response with an average amplitude intensity of 67.6 pm, which increases the localized piezoelectric response of the ceramic coating. ● The local piezoelectric coefficient (PR max) of the 0.92BNT-0.08BT ceramic coating reaches 426.5 pm/V at 15 V, and the ferroelectric domains exhibit significant switching behavior. [ABSTRACT FROM AUTHOR]