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Sintering behaviour and microwave dielectric properties of MgO-2B_(2)O_(3)--xwt%BaCu(B_(2)O_(5))-ywt%H_(3)BO_(3) ceramics

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Journal of Advanced Ceramics 2021年第6期10卷 1282-1290页

作者： Haiquan WANG Shixuan LI Kangguo WANG Xiuli CHEN Huanfu ZHOU Collaborative Innovation Center for Exploration of Hidden Nonferrous Metal Deposits and Development of New Materials in Guangxi Key Laboratory of Nonferrous Materials and New Processing TechnologyMinistry of EducationSchool of Materials Science and EngineeringGuilin University of TechnologyGuilin 541004China

This study investigates the bulk density,sintering behaviour,and microwave dielectric properties of the MgO-2B_(2)O_(3) series ceramics synthesised by solid-state *** to the X-ray diffraction and microstructural analyses,the as-prepared MgO-2B_(2)O_(3) ceramics possess a single-phase structure with a rod-like *** effects of different quantities of H_(3)BO_(3) and BaCu(B_(2)O5)(BCB)on the bulk density,sintering behaviour,and microwave dielectric properties of the MgO-2B_(2)O_(3) ceramics were ***,the optimal sintering temperature was obtained by adding 30 wt%H_(3)BO_(3) and 8 wt%*** also reduced the sintering temperature to 825°***,the addition of 40 wt%H_(3)BO_(3) and 4 wt%BCB increased the quality factor,permittivity,and temperature coefficient of resonance frequency of MgO-2B_(2)O_(3) to 44,306 GHz(at 15 GHz),5.1,and-32 ppm/℃,*** properties make MgO-2B_(2)O_(3) a viable low-temperature co-fired ceramic with broad applications in microwave dielectrics.

关键词： low-temperature co-fired ceramics(LTCC) sintering temperature MgO-2B_(2)O_(3) H_(3)BO_(3) microwave dielectrics temperature coefficient of resonance frequency

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microwave dielectric properties and microstructure of a new kind Eu-based Eu(Mg_(0.5)Ti_(0.5))O_3 ceramic

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Rare Metals 2018年第11期37卷 913-918页

作者： Tao Shi Jing Zhu National Center for Electron Microscopy in Beijing Tsinghua University School of Materials Science and Engineering Tsinghua University The State Key Laboratory of New Ceramics and Fine Processing Tsinghua University Laboratory of Advanced Materials Tsinghua University

A new Eu-based microwave dielectric ceramic,Eu(MgTi)O(EMT for short), was prepared through conventional solid-state reactions. The EMT ceramics were well densified at 1425 ℃ and exhibit good microwave dielectric properties with permittivity of 23.92, high quality factor(Q*f) of 66,957 GHz at 8.93 GHz and relatively low-temperature coefficient of resonant frequency of-20.3 10/K. Additionally, the variations of dielectric constants among Ln(MgTi)O(Ln represents rare earth elements, LMT) compounds were analyzed. Ionic radii of Ln, associated with the tolerance factors of the perovskite structure of LMT, were investigated to be the key factor to influence the permittivity. These results indicate that EMT ceramics might be one of the promising candidates as microwave resonators.

关键词： microwave dielectrics Eu(Mg_(0.5)Ti_(0.5))O_3 Complex perovskite Solid-state reactions

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Effects of W^(6+) substitution on the microwave dielectric properties of Ce_(2)Zr_(3)(MoO_(4))_(9) ceramics

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Journal of Advanced dielectrics 2019年第6期9卷 48-51页

作者： Liang Shi Cheng Liu Huaiwu Zhang School of Electronic Science and Engineering University of Electronic Science and Technology of China Chengdu 610054 P.R.China State Key Laboratory of Electronic Thin Films and Integrated Devices University of Electronic Science and Technology of ChinaChengdu 610054P.R.China

Low temperature sintered Ce_(2)Zr_(3)(Mo_(0.9)W_(0.1)O_(4))_(9)(marked as CZMW)ceramics were synthesized via the conventional solid-state reaction method.X-ray diffraction results showed that the CZMW ceramics belonged to a Trigonal system with R-3C space group,and without any impure phase *** experimental facts revealed that the density and grain morphology greatly affected the microwave dielectric *** samples sintered at 825℃ exhibited good microwave dielectric properties.ε_(r)=9.85,Q×f=22,980 GHz(at 11.3 GHz)and a satisfactoryT_(f)(-1.5 ppm/℃)*** is suggested that the CZMW ceramics are suitable for low-temperature co-fired ceramic(LTCC)applications in microwave devices.

关键词： LTCC microwave dielectrics Ce_(2)Zr_(3)(Mo_(0.9)W_(0.1)O_(4))_(9)ceramics

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