Synthesis and Characteristics of MgO Coated BST-Mg2TiO4 Composite Ceramics

Qian Qian Jia; Hui Ming Ji; Shan Liu; Xiao Lei Li; Zheng Guo Jin

doi:10.4028/www.scientific.net/KEM.512-515.1180

Paper Titles

Synthesis and Characterization of BaTiO₃-(Bi_0.5Na_0.5)TiO₃ Solid Solution Based Dielectric Ceramics
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On Preparation of SrTiO₃ Thin Films with Self-Assembled Monolayers by Liquid Phase Deposition and its Dielectric Properties
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Effect of Annealing Treatments on the Physical Characteristics of (Ca_0.8Sr_0.2)TiO₃ Thin Films by Sol-Gel Method
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Synthesis of Bismuth Titanate Thin Films by Liquid-Phase Self-Assembled Monolayers
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Synthesis and Characteristics of MgO Coated BST-Mg₂TiO₄ Composite Ceramics
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Influence of ZnO and Nb₂O₅ Additions on Sintering Behavior and Microwave Dielectric Properties of (Mg_0.95Ca_0.05 )TiO₃ Ceramics
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Effect of P-Zn-La-Si-Al-N-Mg-Yb Oxides Additives on Sintering and Microwave Dielectric Behaviors of Nd(Co_1/2Ti_1/2)O₃ Ceramics
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Application of AC Impedance Spectroscopy for Characterization of BiNbO₄ Ceramics
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Preparation and Microwave Dielectric Properties of Ca(Sm_0.5Nb_0.5)O₃ Ceramics
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HomeKey Engineering MaterialsKey Engineering Materials Vols. 512-515Synthesis and Characteristics of MgO Coated...

Synthesis and Characteristics of MgO Coated BST-Mg₂TiO₄ Composite Ceramics

Abstract:

The (Ba, Sr)TiO₃ (hereafter BST) ceramics are promising candidate for applying in tunable devices. MgO coated BST-Mg₂TiO₄ (BSTM-MT) composite ceramics were prepared to obtain the low dielectric constant, low dielectric loss, good dielectric constant temperature stability, and high tunability of BST ceramics. The Ba_0.55Sr_0.40Ca_0.05TiO₃ nanoparticles were coated with MgO using the precipitation method and then mixed with Mg₂TiO₄ powders to fabricate BSTM-MT composite ceramics. The morphologies, phases, elements, and dielectric properties of the sintered ceramics were investigated. The core-shell structure of BST powder wrapped with MgO was clearly observed from the TEM image. After sintered at 1100 °C for 2 h, the composite ceramics expressed dense microstructures from SEM images and two main phases BST and Mg2TiO4 were detected in the XRD patterns. The dielectric constant and loss tangent were both reduced after the coating. The reduced dielectric constant and loss tangent of BSTM-MT were 190, 0.0011 (2MHz), respectively. The ceramics exhibited the diffuse phase transition near the Curie temperature and the Curie temperature shifted from 10 °C to 5 °C after the coating. Since the continuous Ti-O bonds were disconnected with the MgO coating, the tunability was reduced to 15.14 % under a DC bias field of 1.1 kV/mm. The optimistic dielectric properties made it useful for the application of tunable capacitors and phase shifters.

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Key Engineering Materials (Volumes 512-515)

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1180-1183

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.512-515.1180

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Online since:

June 2012

Authors:

Qian Qian Jia, Hui Ming Ji, Shan Liu, Xiao Lei Li, Zheng Guo Jin

Keywords:

BST, Chemical Coating Method, Dielectric Property, MgO, Tunability

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