Copper electrodes multilayer ceramic capacitors - Part I - The dielectric composition

摘要

Several sintering aids were tested to lower the CaZrO3 ceramic sintering temperature. Numerous additions are shown to lower the densification temperature and to promote the dielectric properties with a QF product, an insulating resistivity and a permittivity enhancement, and a lowering of the temperature coefficient tau(epsilon). A combination of dopants was tested and optimised, resulting in a low temperature sintering ceramic based on CaZrO3, LiNO3, SiO2 and TiO2. The samples sintered at 1000degreesC in oxidising or reducing atmosphere exhibit very attractive properties, with a QF product of nearly 15, epsilon similar to 28, a near zero tau(epsilon) and rho(i) similar to 10(12) Omega . cm. The sintering mechanisms of this ceramic are also debated. (C) 2004 Kluwer Academic Publishers. [References: 75]