Ferroelectric and dielectric properties of (Na_0.47Bi_0.47Ba_0.06)_0.99Ca_0.01TiO₃ ceramics sintered in different atmospheres

ABSTRACT

The (Na_0.47Bi_0.47Ba_0.06)_0.99Ca_0.01TiO₃ lead-free ferroelectric ceramics were prepared via the conventional solid-state reaction method. The atmospheres of nitrogen and oxygen were chosen during the sintering process, respectively. Both the ceramics sintered in nitrogen and oxygen atmospheres exhibit high relative density (>96%) and pure perovskite structure. The dielectric behaviors with diffusion phase transition were studied via the Curie–Weiss law and the modified Curie–Weiss law. The piezoelectric and ferroelectric properties of the two kinds of ceramics were studied comparatively. Compared to the O₂ fired ceramics, the N₂ fired samples exhibit higher depolarization temperature (T_d= 117°C). The O₂ fired ceramics show higher piezoelectric constant (d₃₃ = 113 pC/N) and higher polarization values (P_m = 40.4 μC/cm², P_r = 34.4 μC/cm²). The differences in the electrical properties of the ceramics sintered in the different atmospheres were discussed.

KEYWORDS:

• Ceramics
• dielectric properties
• ferroelectric properties
• piezoelectric properties

Disclosure statement

No potential conflict of interest was reported by the authors.