Structural, chemical and dielectric properties of ceramic injection moulded Ba(Zn_(1/3)Ta_(2/3))O_3 microwave dielectric ceramics

摘要

We report the development of a ceramic injection moulding (CIM) process to produce complex-shaped structures using high-performance microwave ceramic materials. In particular, we describe the synthesis methods and the structural, chemical and dielectric properties of Ba(Zn_(1/3)Ta_(2/3))O_3 (BZT) doped with Ni and Zr ceramics produced using ceramic injection moulding. Sintering the ceramic injection moulded Ba(Zn_(1/3)Ta_(2/3))O_3 to a relative density of approx 94 percent was possible at a temperature of 1680 deg C and a time of 48 h. The best samples to date exhibit a dielectric constant, epsilon _r, of approx30, a Q value, of approx 31,250 (i.e. tan delta < 3.2 X 10~(-5)) at 2 GHz, and a temperature coefficient of resonance frequency, tau _f, of 0.1 ppm/deg C.