Preparation and property of submicrometre-crystalline Ba0.67Sr0.33TiO3 powders and ceramics
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Submicrometre-particulate pure Ba0.67Sr0.33TiO3 (BST) powders approximately 110 nm in size have been prepared by a solidstate reaction technique. BST ceramics derived from powder calcined at different temperatures were fabricated with various sintering conditions. High-density BST ceramics at all sintering temperatures were obtained at a calcination temperature of 950 oC with the highest 99.6% of the theoretical density. Calcining at 950 oC and sintering at 1300 oC for 2 h , BST ceramic samples with an average grain size about 250 nm were obtained, showing satisfying dielectric properties and ferroelectric properties, with high permittivity εr = 7676, low loss factor tanδ = 0.01 and remanent polarization Pr = 9.2 μC/cm2, coercive electric field Ec = 1.58 kV/cm at room temperature.
Abstract
Submicrometre-particulate pure Ba0.67Sr0.33TiO3 (BST) powders approximately 110 nm in size have been prepared by a solidstate reaction technique. BST ceramics derived from powder calcined at different temperatures were fabricated with various sintering conditions. High-density BST ceramics at all sintering temperatures were obtained at a calcination temperature of 950 oC with the highest 99.6% of the theoretical density. Calcining at 950 oC and sintering at 1300 oC for 2 h , BST ceramic samples with an average grain size about 250 nm were obtained, showing satisfying dielectric properties and ferroelectric properties, with high permittivity εr = 7676, low loss factor tanδ = 0.01 and remanent polarization Pr = 9.2 μC/cm2, coercive electric field Ec = 1.58 kV/cm at room temperature.
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