Crystal Structures and Structure-Property Relations in Microwave Dielectrics

Dielectric oxide ceramics have revolutionized the microwave wireless communication industry by reducing the size and cost of filters and osclillator components in applications ranging from cellular phones to global positioning systems. Commercial microwave ceramics must combine high permittivity, low dielectric loss, and temperature stability. Additionally, Multilayer Ceramic Integrated Circuit (MCIC) technology requires the development of ceramic dielectrics which may be co-fired with high-conductivity metal electrodes; i.e., low temperature co-fired ceramics (LTCC). Commonly, a combination of dielectric properties required for a particular application is achieved by using a complex chemistry, which results in complex structural behavior. Today, limited understanding of these chemistry-structure-properties relations impedes rational search and design of new materials. In this presentation, we will discuss application of advanced techniques of structural/microstructural characterization to the analysis of phase equilibria and crystal-chemistry in a number of oxide ceramic systems, potentially useful for both bulk resonator and LTCC applications. The structure-properties relations in these systems will be discussed.

Back to Archives 2003

Back to Seminar Home Page

Last modified 24-December-2003 by website owner: NCNR (attn: )