Affiliation:
1. Beijing University of Chemical Technology
Abstract
In this work, a sub-micron grained sized (<500nm) ceramic (> 92% of theoretical) has been
obtained using nano-sized BaTiO3 powders synthesized through a high-gravity reactive precipitation
(HGRP) process. Permittivity of the prepared ceramic is greater than 2500. Also, low change ratio of
temperature in the range of −55°C~ 125°C i.e.< ±15% renders the ceramic to meet the EIA X7R
characteristics. In the ceramic compositions, Dy2O3, BaCO3, CaCO3, MnCO3 and MgO were used as
dopants. After being mixed and dry-pressed, the above mentioned compositions in reducing
atmosphere (N2 and 5% H2) were sintered at 1210°C−1290°C for 2h, respectively. Experimental
results show that HGRP BaTiO3 powders have good dielectric properties. The dielectric properties as
well as the microstructure of the ceramic are both sensitive to the change of sintering temperature.
Publisher
Trans Tech Publications, Ltd.
Subject
Mechanical Engineering,Mechanics of Materials,General Materials Science