Microstructure and dielectric tunable properties of Ba0.6Sr0.4TiO3-Mg2SiO4-MgO composite

Ba
_0.6
Sr
_0.4
TiO
₃
-Mg
₂
SiO
₄
-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 Mg
₂
SiO
₄
-MgO into Ba
_0.6
Sr
_0.4
TiO
₃
forms ferroelectric (Ba
_0.6
Sr
_0.4
TiO
₃
)-dielectric (Mg
₂
SiO
₄
-MgO) composites and shifts the Curie temperature to a lower temperature. The dielectric constant and loss tangent of Ba
_0.6
Sr
_0.4
TiO
₃
-Mg
₂
Si
_O4
-MgO composites have been decreased and the overall tunability is maintained at a sufficiently high level. The microwave dielectric properties of Ba
_0.6
Sr
_0.4
TiO
₃
-Mg
₂
Si
_O4
-MgO composites were evaluated. Ba
_0.6
Sr
_0.4
TiO
₃
-Mg
₂
SiO
₄
-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.