Papers by Keyword: Y5V

Abstract: Ba_0.95Ca_0.05Ti_0.85Zr_0.15O₃ (BCTZ) dielectric ceramics were fabricated by traditional solid-state method, using barium carbonate, calcium carbonate, titanium dioxide and zirconium dioxide as the starting materials. Rare earth dopants have a significant influence on the dielectric properties of BCTZ ceramics. The doping effects of Y and Ho with different content on the dielectric properties and structure were studied respectively. The results reveal that the effects of Y and Ho are similar, they perfer to occpy B site, and they move the dielectric peak to lower temperature, widen the peak and increase the insulation resistivity, thus improve the dielectric properties obviously. The effects were investigated by X-ray diffraction, scanning electron microscope, and dielectric property measurements. After rare earth elements-doping, the BCTZ ceramics satify the Y5V EIA specifications, mainly due to the change of structure. The BCTZ dielectric ceramics with high permittivity over 10,000, high insulation resistivity over 10¹² Ωcm, low dielectric loss less than 1%, can be applied in multilayer ceramic capacitors (MLCCs).

Abstract: In this paper, the influence of nickel (Ni) nano-powders addition on the microstructures and dielectric properties of Ba(Ti,Zr)O3 based Y5V non-reducing ceramics were investigated. The X-ray diffraction (XRD) analysis indicated that the primary phase was Ba(Ti,Zr)O3 and no Ni phase appeared until the amount of Ni exceeded 5mol%. Scanning electron microscope (SEM) observation showed that the Ni particles distributed homogenously throughout BTZ ceramic matrix. The incorporation of Ni altered the perovskite lattice parameters and thus led to the change of polarization degree under electric field and the improvement of the dielectric constant at Curie temperature.

Abstract: Titanate ferroelectric materials play more and more important roles in electronic industry due to their particular performances, so the synthesis of ultra-fine ferroelectric powder with high purity is the key issue to improve the performance of electronic components. In this paper, Ba(Ti0.85Zr0.15)O3 nano-powder with perovskite structure and homogeneous granularity was prepared by oxalate precipitation method, the particle size of the powder calcined at 800oC is about 50 nm. The sintering ability of the powder is excellent so that the compact ceramics can be obtained at sintering temperature of 1200°C, which is much lower than that of the powder prepared by the conventional solid method. With the powder prepared by oxalate precipitation method, we developed an ultrafine-grained dielectric material showing Y5V characteristics with the room temperature dielectric constant over 14,000, which can be used in base metal electrodes multilayer chip capacitors.