Anomalous Correlation between Dielectric Constant and Tunability in ( Ba , Sr ) TiO 3 – MgO – Mg 2 SiO 4 Composite Ceramics

• Published in: Journal of the American Ceramic Society Vol. 96; no. 4; pp. 1203 - 1208
• Main Authors: He, Yanyan, Zhao, Jingyuan, Xu, Yebin, Li, Changnian
• Format: Journal Article
• Language: English
• Published: 01.04.2013
• ISSN: 0002-7820; 1551-2916
• DOI: 10.1111/jace.12167

( Ba , Sr ) TiO 3 – MgO – Mg 2 SiO 4 composite ceramics were prepared by a solid‐state reaction method. The microstructures, microwave dielectric characteristics, and tunability of composite ceramics were investigated. An anomalous correlation between tunability and dielectric constant was observed: with the increase in Mg 2 SiO 4 content and the decrease in MgO content, the dielectric constant of ( Ba , Sr ) TiO 3 – MgO – Mg 2 SiO 4 composite ceramics decreases, but the tunability increases. The anomalous increased tunability is beneficial for tunable microwave applications and can be attributed to the redistribution of the electric field. For 50 Ba 0.5 Sr 0.5 TiO 3 –(50− x ) MgO – x Mg 2 SiO 4 , the dielectric constant was decreased from 164.2 to 126.5 by increasing Mg 2 SiO 4 content from 5 to 45 wt% and the tunability at 3.9 kV/mm increased from 11.5% to 15.2%.