AUTHORS: Anand K. Tyagi

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ABSTRACT: Dielectric Resonators have recently attained a great importance in microwave/ mobile communication technology due to their promising characteristics, higher degree of versatility and better frequency stability. Complex Barium Titanate (Ba2Ti9O20) is an important Dielectric Resonator material for microwave communication technology. The present study reports on synthesis of these materials by using the powders derived from Internal Combustion Method. Ca doped single phase materials with nominal composition (Ba1-xCax)2Ti9O20 (0.0≥x≤0.1) have been successfully fabricated in present study. The phase development is found to be a two-step process; first the production of nanocrystalline powders of intermediate phases and second the metallurgical reaction among these nano-powders after consolidation followed by pyroprocessing. This method is found to produce the desired ceramic phase at a lower calcinations temperature in a surprisingly shorter time as compared to the earlier studies reported in literature. The synthesized phase pure materials are found to have improved characteristics that make them suitable to be used as Dielectric Resonator in Microwave/Mobile Communication Technology. Moreover, the dielectric characteristics of these materials are found to be highly sensitive to process parameters like particle size and pH value.

KEYWORDS: Barium Nonatitanate, Dielectric Resonator, Internal Combustion, nano-materials

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