Abstract: A distinct diversification of dielectric character of Ba(Ti_1-yZr_y)O₃ ceramics doped with Yb₂O₃ in different doping style was observed.
When adapted content of Yb₂O₃ is added after synthesis of Ba(Ti_1-yZr_y)O₃, the ferroelectric phase transition points of the ceramics are shifted distinctly,
and the dielectric constants at these points increase greatly. This doping method at 1250℃ results in the sample with a high dielectric constant over
25000 at room temperature and according with Y5V specifications. The enhancement of dielectric constant of Ba(Ti_1-yZr_y)O₃ caused by the doping of Yb₂O₃
after synthesis is associated with the localization of electrons produced by donor doping. Doping by Yb₂O₃ before synthesis results in the sample with a relative
low dielectric constant and a weak efficiency of Curie point shifting. This is due to the compensation of localized-electrons by acceptors that introduced by
the doping of Yb³⁺ replacing Ti site in perovskite lattice.

Key words: Yb₂O₃, Ba(Ti_1-^yZr^_y)O₃, dielectric properties