Anomalous Correlation between Dielectric Constant and Tunability in (Ba, Sr)TiO3–MgO–Mg2SiO4 Composite Ceramics. Issue 4 (25th January 2013)

• Record Type: Journal Article
• Authors: He, Yanyan; Zhao, Jingyuan; Xu, Yebin; Li, Changnian; Randall, C.
• Is Part Of: Journal of the American Ceramic Society. Volume 96:Issue 4(2013)
• Page Start: 1203
• Page End: 1208
• Publication Date: 2013-01-25
• Subjects: Ceramics -- Periodicals; 620.1405
• DOI: 10.1111/jace.12167
• Languages: English
• ISSNs: 0002-7820

Abstract

<abstract abstract-type="main" id="jace12167-abs-0001"> <title> <x xml:space="preserve">Abstract</x> </title> <p>(Ba, Sr)TiO₃–MgO–Mg₂SiO₄ 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 Mg₂SiO₄ content and the decrease in MgO content, the dielectric constant of (Ba, Sr)TiO₃–MgO–Mg₂SiO₄ 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 50Ba_0.5Sr_0.5TiO₃–(50−<italic>x</italic>)MgO–<italic>x</italic>Mg₂SiO₄, the dielectric constant was decreased from 164.2 to 126.5 by increasing Mg₂SiO₄ content from 5 to 45 wt% and the tunability at 3.9 kV/mm increased from 11.5% to 15.2%.</p> </abstract>