Investigation of the effect of particle size on the 10 GHz microwave properties of Ba_1−xSr_xTiO₃ / MgO composite ceramics

Abstract

Abstract The objective of this study is to determine the effect of milling on the X-Band microwave properties of Ba0.6Sr0.4TiO3 / MgO {wt% MgO= 0 to 60 wt%} composites. At low frequency, the effect of the reduction of the overall particle size of the materials from attritor milling is dependent on the additive oxide content; for samples with oxide content > 5.0 wt%, the dielectric constant, and tunability (%) are decreased. Whereas, milled Ba0.6Sr0.4TiO3 / MgO[1] {wt% MgO= 0 to 1 wt%} composites exhibit low loss tangents, higher tunabilities, and higher dielectric constants than unmilled samples. The present study is focused on the effect of milling on the dielectric properties of Ba0.6Sr0.4TiO3 / MgO composites at microwave frequency. The samples were evaluated in a 10 GHz resonator cavity. Additionally, the effect of barium content and MgO content on the 10 GHz dielectric properties of BaxSr1−xTiO3 (x = 0.45, 0.50, 0.55, 0.60) / MgO (MgO = 1 − 60 Wt%) are investigated. These results are correlated with relevant material characterization techniques including FT-Raman studies. Key Words: Barium Strontium TitanatePhased Array AntennasLow Loss Tunable DielectricsCeramic Composites