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2004•Ferroelectrics Letters SectionRequires access

Dielectric Tunability of BST:MgO Composites Prepared by Using Nano Particles

Shashnk Agrawal, Ruyan Guo, D. K. Agrawal, Amar Singh Bhalla, R. R. Neurgaonkar, Chris B. Murray

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Abstract

The dielectric properties of ferroelectric Ba0.5Sr0.5TiO3 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:MgO 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.

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What this paper is about

The dielectric properties of ferroelectric Ba0.5Sr0.5TiO3 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:MgO 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.

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Available abstract

The dielectric properties of ferroelectric Ba0.5Sr0.5TiO3 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:MgO 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.

Key concepts: Materials science, Dielectric, Composite material, Ferroelectricity, Dielectric loss, Nano-, Curie temperature, Microwave

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