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Low-temperature growth of Ba(Zr 0.2 Ti 0.8)O 3-0.5(Ba 0.7 Ca 0.3)TiO 3 (BZT-0.5BCT) films, at temperatures as low as 550 °C, was successfully achieved by a sol-gel route using a LaNiO 3 seed layer. The influence of the seed layer on the crystallization behavior and electric properties of the films was investigated in detail. It was found that low interfacial diffusion and high (100) orientation were simultaneously achieved by introducing a seed layer between films and substrates. Low leakage current density was obtained as a result of low-temperature crystallization and low interfacial diffusion, and the piezoelectric coefficient remained at a relatively high value because of the high orientation. This study showed that low-temperature

In this paper, t mol% Nb2O5 doped x(Ba0.7Ca0.3)TiO3-(1-x)Ba(Zr0.2Ti0.8)O3[xBCT-(1-x)BZT-t mol% Nb2O5] lead-free piezoelectric ceramics were prepared successfully using a solid-state reaction technique. Firstly, the phase transition ofxBCT-(1-x)BZT ceramics were investigate, and it was found that 0.47BCT-0.53BZT sample shows a rhombohedral (R)-tetragonal (T) phase transition at room temperature near Morphotropic Phase Boundary and presents better ferroelectric and piezoelectric properties compared with the other component ceramics. On this basis, the crystal structure, surface morphologies and electrical properties of the Nb2O5 doped 0.47BCT-0.53BZT ceramic were studied in detail. It was found the grain size increases monotonously and the microstructure become more denser and homogeneous when Nb-doping concentration increases above t=0.3, and a maximum strain value of 0.132%

We report a novel low-density polyethylene (LDPE) composite filled with nickel-coated CaCu3Ti4O12 ceramic (denoted as CCTO@Ni), prepared by a melt mixing technique, and its prominent dielectric characteristics. The effects of magnetic field treatment on the dielectric properties of CCTO@Ni/LDPE composite films with a low filler concentration of 10 vol.% were investigated. Our results show that the dielectric permittivity, loss tangent, and conductivity of the LDPE composite films initially improved and then decreased with increasing treatment time under the applied magnetic field. Magnetic field treatment for 60 min led to an ultra-high dielectric permittivity value of 1.57 × 104, four orders of magnitude higher than that of the pure LDPE material. Our results indicate that the magnetic treatment may have induced a percolation effect and enhanced the interfacial polarization of the CCTO@Ni/LDPE composite, resulting in the observed changes in its dielectric properties.

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