Preparation and Dielectric Properties of (BaxSr1-x)TiO3/Mg2TiO4 Composite Ceramics with A Functionally Graded Structure

doi:10.3724/SP.J.1077.2014.12744

Abstract

Abstract: (Ba_xSr_1-x)TiO₃/Mg₂TiO₄ composite ceramics with a constituent graded structure were prepared by a solid-state reaction method. Their microstructure and dielectric properties were analyzed by X-Ray diffraction (XRD), Scanning Electron Microscope (SEM), Energy Dispersive Spectroscope (EDS) and dielectric property measurements. The results show that the samples sintered at 1375℃ for 3 h are a composite phase of perovskite and spinel structure with a Ba/Sr ratio composition gradient. Compared with the composite samples with a fixed Ba/Sr ratio, the graded samples possess higher tunability and better temperature stability of dielectric properties. At room temperature (20℃), the tunability of a typical sample is 21.9% under an external DC field of 2 kV/mm, and it maintains a high value of 9.3% at high temperature of 60℃. The improvement of temperature stability is due to the difference in Curie temperature for different layers in gradient (Ba,Sr)TiO₃. Meanwhile, the introduction of the composition gradient in this material helps us to obtain a wide temperature application range for the related device.

Key words: composite ceramics, (Ba_xSr_1-x)TiO₃/Mg₂TiO₄, functionally graded materials, dielectric properties

CLC Number:

TB34

LI Jun, WANG Xu-Sheng, CHAI Xiao Na, LIU Peng. Preparation and Dielectric Properties of (Ba_xSr_1-x)TiO₃/Mg₂TiO₄ Composite Ceramics with A Functionally Graded Structure[J]. Journal of Inorganic Materials, 2014, 29(1): 52-56.

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Preparation and Dielectric Properties of (Ba_xSr_1-x)TiO₃/Mg₂TiO₄ Composite Ceramics with A Functionally Graded Structure

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