Structural and Dielectric Properties of Rare Earth (Y, Ho) Doped Ba_0.95Ca_0.05Ti_0.85Zr_0.15O₃ Ceramics

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).

• Periodical: Key Engineering Materials (Volumes 602-603)
• Pages: 728-733
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.602-603.728
• Online since: March 2014
• Authors: Zheng Bo Shen, Xiao Hui Wang*, Hui Ling Gong, Long Tu Li
• Keywords: Dielectric Property, Rare Earth Dopants, Solid-State Method, Y5V

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