Extremely High Tunability of Low Dielectric Constant 1-3 Type ( Ba, Sr) TiO3/Resin Epoxy.

A 1-3 type ( Ba, Sr) TiO3 ( BST)/resin epoxy composites were prepared by dice and fill technique. The microstructure, dielectric, and tunable properties of columnar composites were investigated. An important feature of 1-3 type composites is that the dc field is efficiently applied to the high-permittivity ferroelectric phase. With the increase of resin epoxy content, the tunability of the composite remains nearly unchanged while the permittivity decreases much. The coefficient of dielectric nonlinearity β increases sharply with the increase of resin epoxy volume and β increases up to 2.8 × 1012 when the resin epoxy volume is 90%. These properties make 1-3 type composites very promising for potential tunable device applications. [ABSTRACT FROM AUTHOR]