Effect of Post-Annealing on (Ca07Sr0.3)(Zr0.8Ti0.2)O3 Films on Pt and Cu Substrates Fabricated by Aerosol Deposition.

We investigated the annealing effect of CSZT films on Pt and Cu substrates fabricated by aerosol deposition (AD) process. The fabricated films were annealed at 100, 250, and 500 degrees C, and all XRD patterns revealed CSZT phase with a perovskite structure, with the exception of the films on Cu substrates annealed at 250 and 500 degrees C, which presented a CuO secondary phase. The dielectric constant and the dielectric loss of the CSZT films on the Pt substrates were observed to increase slightly as the annealing temperature increased. However, the Cu substrates annealed at 250 degrees C presented lower values. The leakage current of films on the Pt substrate decreased as the annealing temperature increased. On the other hand, the films on a Cu substrate increased as the annealing temperature increased, and these results showed that the films on Cu substrates have inferior properties due to the presence of CuO.

Dielectric and piezoelectric properties of lead-free 0.5Ba(Zr0.2 Ti0.8)O3-0.5(Ba0.7Ca0.3)TiO3 piezoelectric ceramics with glass additive.

We have investigated the dielectric and piezoelectric properties of lead-free 0.5Ba(Zr0.2Ti0.8)O3-0.5(Ba0.7Ca0.3)TiO3 ceramics with BaO-CaO-SiO2 glass additive as a function of sintering temperatures. With adding BaO-CaO-SiO2 glass additive, diffusivity of lead-free 0.5Ba(Zr0.2Ti0.8)O3-0.5(Ba0.7Ca0.3)TiO3 ceramics was increased. The dispersion constant γ of BZT-BCT ceramics with BaO-CaO-SiO2 glass was changed from 1.9683 to 1.7673 by decreasing sintering temperature ranging from 1450 degrees C to 1350 degrees C, while 0.5Ba(Zr0.2Ti0.8)O3-0.5(Ba0.7Ca0.3)TiO3 ceramics at sintered 1450 degrees C showed γ = 1.5055. The piezoelectric properties such as electromechanical coupling factor (k(p)) and piezoelectric constant (d33) of lead-free 0.5Ba(Zr0.2Ti0.8)O3-0.5(Ba0.7Ca0.3)TiO3 ceramics with BaO-CaO-SiO2 glass additive sintered at 1400 degrees C showed similar values compared with 0.5Ba(Zr0.2Ti0.8)O3-0.5(Ba0.7Ca0.3)TiO3 ceramics without BaO-CaO-SiO2 glass additive sintered at 1450 degrees C. The addition of BaO-CaO-SiO2 glass additive can be of help to decrease sintering temperature of lead-free 0.5Ba(Zr0.2Ti0.8)O3-0.5(Ba0.7Ca0.3)TiO3 ceramics.