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2012•Journal of Jining UniversityRequires access

Effect of Al_2O_3 Doping on the BSTO/MgO Ferroelectric Ceramic

Du Shiwen

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Abstract

Based on w(MgO) =55%magnesia mixed with Ba0.55Sr0.45TiO3(BSTO),the influence of Al2O3 dopant on the dielectric properties of BSTO /MgO was investigated.With the increase of the quality of Al2O3 dopant,the dielectric constant of BSTO/MgO material reduced,the loss tangents decreased first and then increased,and tunability first increased then decreased,but excess quantity of Al2O3 would lower tunability.When the quantity of Al2O3 was mol(Al2O3) = 0.5%,the dielectric loss of BST/MgO material achieved minimum,which was equal to 2.0×10-3(10KHz),and the dielectric constant tunability 14.1%(4kV/mm) could be obtained.By virtue of the theory of dielectric,the mechanism on the influence of Al2O3 dopant on the dielectric properties of BST/MgO was analysed.

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What this paper is about

Based on w(MgO) =55%magnesia mixed with Ba0.55Sr0.45TiO3(BSTO),the influence of Al2O3 dopant on the dielectric properties of BSTO /MgO was investigated.With the increase of the quality of Al2O3 dopant,the dielectric constant of BSTO/MgO material reduced,the loss tangents decreased first and then increased,and tunability first increased then decreased,but excess quantity of Al2O3 would lower tunability.When the quantity of Al2O3 was mol(Al2O3) = 0.5%,the dielectric loss of BST/MgO material achieved minimum,which was equal to 2.0×10-3(10KHz),and the dielectric constant tunability 14.1%(4kV/mm) could be obtained.By virtue of the theory of dielectric,the mechanism on the influence of Al2O3 dopant on the dielectric properties of BST/MgO was analysed.

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Available abstract

Based on w(MgO) =55%magnesia mixed with Ba0.55Sr0.45TiO3(BSTO),the influence of Al2O3 dopant on the dielectric properties of BSTO /MgO was investigated.With the increase of the quality of Al2O3 dopant,the dielectric constant of BSTO/MgO material reduced,the loss tangents decreased first and then increased,and tunability first increased then decreased,but excess quantity of Al2O3 would lower tunability.When the quantity of Al2O3 was mol(Al2O3) = 0.5%,the dielectric loss of BST/MgO material achieved minimum,which was equal to 2.0×10-3(10KHz),and the dielectric constant tunability 14.1%(4kV/mm) could be obtained.By virtue of the theory of dielectric,the mechanism on the influence of Al2O3 dopant on the dielectric properties of BST/MgO was analysed.

Key concepts: Dopant, Dielectric, Materials science, Doping, Dielectric loss, Ferroelectricity, Ceramic, Dissipation factor

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