Effects of CuO additive on structure and electrical properties of low-temperature sintered Ba0.98Ca0.02Zr0.02Ti0.98O3 lead-free ceramics

Optical constants of CuO and ZnO particles in the terahertz frequency range

“…The experimental data has been fitted with the Jonscher's universal power law, widely used for fitting frequency dependence of conductivity [52] Eq. (9) where σ 0 is the zero-frequency electrical conductivity, and the pre-factor A (not electric-field amplitude here) and exponent n (not refractive index here) depend on the material and temperature. The value of n is smaller than unity when the conductivity is dominated by the long-range movement of charge carriers; meanwhile it is larger than 1 when short-range hopping dominates transport [53][54][55][56].…”

“…Furthermore, there has been increasing interest paid to the use of these materials as additives to improve the energy-storage capacity in various advanced ceramics. There have been many studies for both, CuO [8][9][10][11] and ZnO [12][13][14][15] highlighting their potential for energy-storage applications. Clearly, the dielectric properties of these oxides are key parameters that determine the final energy-storage properties of the composite.…”

Phase transition and improved electrical performance of Ba0.85Ca0.15Zr0.1Ti0.9O3–Ca0.28Ba0.72Nb2O6 ceramics with high Curie temperature

“…However, high sintering temperatures (~1450 °C), low Curie temperatures (T c~8 0 °C), and weak temperature stabilities hinder their use in practical applications [4,5]. To date, considerable research has been carried out to optimize the synthesis and electrical performances of BZTxBCT based systems: by tuning the Ba/Ca or Zr/Ti ratio [6,7], by doping the metal oxide and sintering aids [2,5, 8], and by adapting new preparation techniques, such as hot-pressing and spark plasma sintering [4,9]. Unfortunately, any improvement in the electrical properties of these systems is usually derived at the expense of the sintering temperature and temperature stability, limiting their practical application.…”

Barium hexaferrites with narrow ferrimagnetic resonance linewidth tailored by site‐controlled Cu doping

“…The replacement of Cu 2+ ions for Fe 3+ ions has great potential to reduce the H a of BaM. Meanwhile, the liquid‐phase sintering mechanism of Cu 2+ ions could increase the densification degree of materials 29–31 . However, the distribution of Cu elements in the polycrystalline microstructure is still obscure, and the regulating mechanism of Cu doping on textured barium hexaferrite is still unclear.…”