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Relationship between structure and properties of microwave dielectric ceramic Li_((1+x))2MgTi3O8 based on Li non-stoichiometry

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Journal of Materiomics 2023年第2期9卷 279-288页

作者： Kui Liu Cheng Liu Jie Li Lichuan Jin Huaiwu Zhang School of Electronic Science and Engineering University of Electronic Science and Technology of ChinaChengdu610054China State Key Laboratory of Electronic Thin Film and Integrated Devices University of Electronic Science and Technology of ChinaChengdu610054China

Li(_(1+x))2MgTi3O8(0.0≤x≤0.10)ceramics with Li non-stoichiometric ratios were prepared by the solidstate reaction method to inhibit the volatilization of Li.The effects of the Li non-stoichiometric ratios on the sintering behavior,crystal structure,microscopic morphology,Raman vibrations,electron density,and dielectric properties of Li(_(1+x))2MgTi3O8 ceramics were systematically investigated.The Li(1+0.06)_(2)MgTi_(3)O_(8)ceramics demonstrate the best dielectric properties withεr=26.33,Q×f=69435 GHz(@6.87 GHz,54%improvement),tf=2.95×10^(-6)℃^(-1).For the non-intrinsic factors,the high relative density(97.15%)and larger grain size(16.78 mm)allow the dielectric properties to be improved.As for the intrinsic factors,a reasonable excess of Li improves the bond ionicity of the MgdO bond,the lattice energy of the TidO bond,and the electron cloud density,thus optimizing the dielectric properties.Raman spectroscopy leads to the same result from the point of view of lattice vibrations.At the same time,the distortion of the polyhedra is also improved,so that tf also approaches 0.The improved Li(1+0.06)2MgTi3O8 has potential applications in microwave communication technology.

关键词： Li(1+x)_(2)MgTi_(3)O_(8) Raman vibration First-principles P-V-L theory microwave dielectric

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Structure instability and high microwave dielectric permittivity of nonstoichiometric(Sr_(0.4)Ce_(0.4))_(1-x)Nd_(x)Ti_(0.8)Mg_(0.2)O_(3)system for wireless communication

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Journal of Materiomics 2021年第1期7卷 25-33页

作者： Burhan Ullah Wen Lei Xianwei Wang Bihui Zhang Wen-Zhong Lu School of Optical and Electronic Information Huazhong University of Science and TechnologyWuhan430074China Key Lab of Functional Materials for Electronic Information(B) Ministry of EducationWuhan430074China Department of Physics Islamia College University PeshawarPakistan Laboratory of Functional Materials School of PhysicsHenan Normal UniversityXinxiang453007China

(Sr_(0.4)Ce_(0.4))_(1-x)Nd_(x)Ti_(0.8)Mg_(0.2)O_(3)[(SC)NdTMgO3,x=0.1-0.4]non-stoichiometric system were obtained through conventional solid-state synthesis technique.All perovskite peaks were attributed to either single(x0.3,the(SC)NdTMgO3 compound,exhibits structure instability and(200)/(310)peaks splitting.The peaks splitting indicates cubic(C-phase)to tetrogonal(T-phase)structure phase transition.All ceramic samples appear nearly dense,presenting a non-uniform grain size distribution.The observed trend of the microwave dielectric properties(er,tf,Q×f)is mainly related to the formation of structure phase transition,packing fraction,relative density and ionic polarizability.A key microwave(MW)dielectric properties of er=53,Q×f=26,700 GHz and tf=+2.8 pmm/℃could be obtained for composition with x=0.4.

关键词： (SC)NdTMgO_(3)system Phase transition microwave dielectric

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SINTERING BEHAVIOR AND microwave dielectric PROPERTIES OF NOVEL LOW TEMPERATURE FIRING Bi_(3)FeMo_(2)O_(12)CERAMIC

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Journal of Advanced dielectrics 2011年第4期1卷 379-382页

作者： DI ZHOU LI-XIA PANG JING GUO YING WU GAO-QUN ZHANG HONG WANG XI YAO Electronic Materials Research Laboratory Key Laboratory of the Ministry of Education Xi'an Jiaotong University Xi'an 710049P.R.China Laboratory of Thin Film Techniques and Optical Test Xi'an Technological University Xi'an 710032P.R.China International Center for dielectric Research Xi'an Jiaotong University Xi'an 710049P.R.China

In the present work,a novel low temperature-ring Bi_(3)FeMo_(2)O_(12) ceramic was synthesized via the solid-state reaction method.The monoclinic Bi_(3)FeMo_(2)O_(12) phase can be formed at a low temperature 670℃.A relative density above 96%can be obtained when sintering temperature is above 800℃.The Bi_(3)FeMo_(2)O_(12) ceramic sintered at 845℃ for 2 h shows high microwave dielectric performance with a permittivity-27.2,a Qf value of 14,500GHz and a temperature coefficient of-80 ppm/℃.It might be a candidate for low temperature co-fired ceramics technology.

关键词： microwave dielectric low-temperature co-fired ceramic(LTCC) bismuth molybdate

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Modification of Ba6-3xSm8+2xTi18O54 （x=2/3） microwave dielectric Ceramics by Nd/Bi Co-substitution on A-site

Modification of Ba6-3xSm8+2xTi18O54 （x=2/3） Microwave Diel...

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The 3～〔rd〕International Conference on High-Performance Ceramics(CICC-3)（1）

作者： N. Qin and X.M. Chen Department of Materials Science & Engineering Zhejiang University Hangzhou 310027 China

＜正＞ Ba6-3xSm8+2xTi18O54 microwave dielectric ceramics were modified by Nd/Bi co-substitution for Sm on A-site. According to XRD and SEM analysis, a single-phase solid solution with new tungsten bronze-type structure was formed in low-Bi-substituted region. Bi was effective on increasing dielectric constant, while led to a decreased Qf value and an increased negative τf. The co-substituting approach exhibited the advantage in improving εand compensating Qf and τf value.

关键词： microwave dielectric Microstructure Ba6-3xSm8+2xTi18O54 Co-substitution

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Dual-band LTCC antenna based on 0.95Zn_2SiO_4-0.05CaTiO_3 ceramics for GPS/UMTS applications

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Chinese Physics B 2015年第10期24卷 572-575页

作者：窦刚李玉霞郭梅 College of Electrical Engineering and Automation Shandong University of Science and Technology

In this paper, we present a compact low-temperature co-fired ceramic（LTCC） dual-band antenna by using the electromagnetic coupling effect concept for global positioning system（GPS） and universal mobile telecommunication system（UMTS） applications. The overall dimension of the antenna is 8.6 mm × 13.0 mm × 1.1 mm. It consists of double meander lines and a via hole line. The top meander line operates at the upper band, and the bottom radiating patch is designed for the lower band. The via-hole line is employed to connect the double meander lines. Because of the effect of the coupled line,total dimension of the proposed antenna is greatly reduced. With the 2.5： voltage standing wave ratio（VSWR） impedance bandwidth definition, the lower and upper bands have the bandwidths of 110 MHz and 150 MHz, respectively. The proposed antenna is successfully designed, simulated, and analyzed by a high frequency structure simulator（HFSS）. And the antenna is manufactured by using the 0.95Zn2SiO4-0.05 CaTiO3ceramics（εr = 7.1, tanδ = 0.00038） that is prepared by ourselves. The results show that the antenna is compact, efficient, and of near omnidirectional radiation pattern.

关键词： low-temperature co-fired ceramic compact antenna microwave dielectric Zn2SiO4-CaTiO3

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