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Preparation of BST Ceramics and their Dielectric Properties

Yongxin Sun

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Abstract

Ba0.6Sr0.4TiO3(BST) nanopowders were prepared by microwave hydrothermal(MH) synthesis,and then the a-sintered samples' dielectric properties were tested and compared with the same compositional material prepared by conventional processing(CP).The results show that the synthetic temperature of BST powder reduced from CP′s 1 100 ℃ to MH synthesis' 195 ℃,and the BST ceramic(by MH route) with fine grain(3 μm) can be obtained by sintering at 1 230 ℃ for 2 h.With the decrease of grain size,the BST ceramics' relative dielectric constant and dielectric loss reduce,and especially their dielectric loss factor reduces greatly.

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What this paper is about

Ba0.6Sr0.4TiO3(BST) nanopowders were prepared by microwave hydrothermal(MH) synthesis,and then the a-sintered samples' dielectric properties were tested and compared with the same compositional material prepared by conventional processing(CP).The results show that the synthetic temperature of BST powder reduced from CP′s 1 100 ℃ to MH synthesis' 195 ℃,and the BST ceramic(by MH route) with fine grain(3 μm) can be obtained by sintering at 1 230 ℃ for 2 h.With the decrease of grain size,the BST ceramics' relative dielectric constant and dielectric loss reduce,and especially their dielectric loss factor reduces greatly.

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Available abstract

Ba0.6Sr0.4TiO3(BST) nanopowders were prepared by microwave hydrothermal(MH) synthesis,and then the a-sintered samples' dielectric properties were tested and compared with the same compositional material prepared by conventional processing(CP).The results show that the synthetic temperature of BST powder reduced from CP′s 1 100 ℃ to MH synthesis' 195 ℃,and the BST ceramic(by MH route) with fine grain(3 μm) can be obtained by sintering at 1 230 ℃ for 2 h.With the decrease of grain size,the BST ceramics' relative dielectric constant and dielectric loss reduce,and especially their dielectric loss factor reduces greatly.

Key concepts: Materials science, Dielectric, Ceramic, Sintering, Grain size, Dielectric loss, Hydrothermal circulation, Composite material

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