Microstructure and Dielectric Tunable Properties of Ba0.6Sr0.4TiO3-Mg2SiO4-MgO Composite.

Ba0.6Sr0.4TiO3-Mg2SiO4-MgO composite ceramics were prepared by a solid-state reaction method and their dielectric tunable characteristics were investigated for the potential application as microwave tunable materials. The addition of Mg2SiO4-MgO into Ba0.6Sr0.4TiO3 forms ferroelectric (Ba0.6Sr0.4TiO3)-dielectric (Mg2SiO4-MgO) composites and shifts the Curie temperature to a lower temperature. The dielectric constant and loss tangent of Ba0.6Sr0.4TiO3-Mg2SiO4- MgO composites have been decreased and the overall tunability is maintained at a sufficiently high level. The microwave dielectric properties of Ba0.6Sr0.4TiO3-Mg2SiO4-MgO composites were evaluated. Ba0.6Sr0.4TiO3-Mg2SiO4-MgO composites have tunability of 9.2 to 10.5% at 100 kHz under 2 kV/mm, indicating that it is a promising candidate material for tunable microwave applications requiring a low dielectric constant. [ABSTRACT FROM AUTHOR]