Dielectric tunability of BST:MgO composites prepared by using nano particles

The dielectric properties of ferroelectric Ba0.5Sr 0.5TiO3 and non-ferroelectric MgO composites synthesized by using nano particles are investigated for tunable microwave applications. Dielectric properties are studied in the temperature range of -250°C to 100°C, with and without an electrical field. The dielectric tunability is ∼50% for BST composites under the field of 80 KV/cm. at around the Curie peak. The use of nano particle sizes of materials considerably reduces dielectric losses and shows comparatively high K-factor values in the resulted composites. The ferroelectric phase is well connected and thus enhances the overall dielectric properties of the composites.