Effects of CeO2 Additive on Property of Ba0.6Sr0.4TiO3-MgO Ceramics for Phase Shifter

Xiao Hong Wang; Wen Zhong Lu; Gui Fen Fan; Dong Xiang Zhou

doi:10.4028/www.scientific.net/KEM.336-338.275

Paper Titles

The Microwave Characteristics of Glass-Ba₂Ti₉O₂₀ Ceramics
p.262

Effects of Ta⁵⁺ Substitution on Structure Transition and Microwave Dielectric Properties of Zn(Nb_1-xTa_x)₂O₆ Ceramics
p.265

Influence of Hydrothermal Conditions on ZST Powders for Microwave Ceramics
p.269

Dielectric Properties of Ba(Mg_0.2/3Zn_0.8/3Nb_2/3)O₃ and Ba_1-xSr_x(Mg_0.2/3Zn_0.8/3Nb_2/3)O₃ Microwave Ceramics
p.272

Effects of CeO₂ Additive on Property of Ba_0.6Sr_0.4TiO₃-MgO Ceramics for Phase Shifter
p.275

Effects of CuO and V₂O₅ Addition on Sintering Behavior and Microwave Dielectric Properties of (1-x)Ca₂P₂O_7-xTiO₂
p.279

Structure and Dielectric Properties of Zn Doped PST Thin Films Prepared by Sol-Gel Method
p.283

Microwave Dielectric Properties of (1-x)(Ca_0.61Nd_0.26)TiO₃–x(Li_0.5Sm_0.5)TiO₃
p.287

Temperature Compensated (1-x)(Na_0.5La_0.5)TiO₃+xCeO₂ Microwave Dielectric Ceramics Incorporated with Copper Oxide
p.290

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Effects of CeO₂ Additive on Property of Ba_0.6Sr_0.4TiO₃-MgO Ceramics for Phase Shifter

Abstract:

The effects of cerium oxide on the dielectric properties and tunable properties of barium strontium titanate/magnesia (40wt%Ba0.6Sr0.4TiO3-60wt%MgO) compound ferroelectric material for improving the properties of phase shifter were investigated. The mechanism was also presented and discussed. The XRD patterns analysis showed that with increasing quantities of cerium oxide x (wt%), the lattice constant of BST-MgO material first increased to x=0.4, then changed a little till x=1.2. Further additions of CeO2 decreased the lattice constant. The dielectric properties at 10 kHz and microwave frequency were studied. The addition of CeO2 influences the dielectric constant, loss tangent and tunability greatly. The permittivity decreased with increase of cerium oxide nearly linearly. The addition of CeO2 effectively decreased the loss in BSTM ceramic. Optimum doping amount of CeO2 reduced the high frequency loss tangents of BST-MgO compound which also ensured the moderate dielectric constant and tunability. When the doping amount of CeO2 is 1.2wt%, BST-MgO composite has the following properties: εr = 92.64, tanδ = 0.00449 (at 2.6166 GHz) and tunability = 9.67% (at 2kV/mm), it is suitable for ferroelectric phase shifter.