Low-loss(Sr,Ce)TiO_(3)—Sr_(2)CeO_(4)—B_(2)O_(3) ceramics composite featuring balanced microwave dielectric properties for miniaturized wireless communication applicationsOA
A series of(Sr0.4Ce0.4)TiO_(3)+4%(in mass)Sr_(2)CeO_(4)+x%B_(2)O_(3)(SCTO+4%SCO+x%B_(2)O_(3) for 1≤x≤5)composites were synthesized via solid-state reaction to investigate the effects of Sr_(2)CeO_(4) and B_(2)O_(3) additives on their structural evolution and microwave dielectric properties.X-ray diffraction(XRD)and Rietveld refinement confirmed the dominant orthorhombic phase(O-phase),with SCO as a secondary phase,indicating a chemically stable composite system.HRTEM and SAED analyses further confirmed the formation of the O-phase through direct observation of the superlattice reflections.Microstructural evolution demonstrated B_(2)O_(3)-assisted liquid-phase sintering,reducing porosity(0.017→0.006)and increasing grain size(3.34→6.01μm)with increasing x%(in mass).Raman spectroscopy verified octahedral tilting and Ce—O stretching,while B_(2)O_(3) incorporation modified the TiO6 network via BO_(3)/BO_(4) interactions.Theεr decreased from 113(SCTO)to 27 at x=5%,whileτf improved from+213 to+12×10^(-6)/℃.The reduction inε_(r) arises from a complex interplay of internal factors(ionic polar-izability)and external factors(porosity,and density),whereas the variation inτf is governed by compensating effects from Sr_(2)CeO_(4) and B_(2)O_(3).Optimal microwave performance was achieved at x=5%,with Q×f=43,603 GHz,ε_(r)=27,andτ_(f) of+12×10^(-6)/℃.The study demonstrates that SCO and B_(2)O_(3) act as effective modifiers,enhancing densification and dielectric properties in SCTO-based microwave ceramics.
Tauqeer Ahmad;Wen Lei;Burhan Ullah;Wen-zhong Lu
School of Optical and Electronic Information,Key Lab of Functional Materials for Electronic Information(B)of MOE,Huazhong University of Science and Technology,Wuhan,430074,ChinaSchool of Optical and Electronic Information,Key Lab of Functional Materials for Electronic Information(B)of MOE,Huazhong University of Science and Technology,Wuhan,430074,China Advanced Manufacturing Institute of Huazhong University of Science and Technology in Wenzhou,Zhejiang Key Laboratory of Electronic Functional Ceramics and Devices,Wenzhou,325035,Zhejiang,ChinaSchool of Optical and Electronic Information,Key Lab of Functional Materials for Electronic Information(B)of MOE,Huazhong University of Science and Technology,Wuhan,430074,ChinaSchool of Optical and Electronic Information,Key Lab of Functional Materials for Electronic Information(B)of MOE,Huazhong University of Science and Technology,Wuhan,430074,China Advanced Manufacturing Institute of Huazhong University of Science and Technology in Wenzhou,Zhejiang Key Laboratory of Electronic Functional Ceramics and Devices,Wenzhou,325035,Zhejiang,China
通用工业技术
SCTO compositeMedium permittivityPhase analysisWireless communication
《Journal of Materiomics》 2026 (2)
P.251-259,9
support from the Na-tional Nature Science foundation of China(U21B2068).
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