Synthesis and Characterization of Ceramic Dielectric Resonator Materials for Microwave Communication Technology

AbstractThe Ceramic Technology has witnessed an exponential growth in last decade making available a number of newer materials with improved characteristics for several state of art engineering applications. Recently technological advancements and availability of suitable Ceramic Dielectric Resonators that function as the important circuit elements, the microwave communication technology has undergone a complete overhaul. The present work attempts to investigate these materials with special emphasis to Di-barium Nonatitanate (Ba2Ti9O20) that has low loss; quality factor Q>10,000, temperature stable high relative permittivity (∼39) and a very small change in resonant frequency as a function of temperature (∼4ppm/K). The fabrication of very dense bodies of Ba2Ti9O20 ceramic with phase purity is of great practical importance. The realization of monophasic Ba2Ti9O20 had, however, been a challenge. The synthesis of phase pure (Ba 1-x Cax)2Ti9O20 materials with improved characteristics using narrow particle size distribution among the nano-crystallites with higher surface area and better sinterability, obtained through internal combustion based Precursor Method has been reported in this paper. The results of characterization and evaluation have been discussed in terms of the physico-chemical aspects