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ratio of Al/Si in the xerogel, the amount of Al2O3 in the powder synthesized increases, which reduces both e′, the real part of complex permittivity, and tgd(e″/e′), the dissipation factor, where e″ is the imaginary part of complex permittivity. Key words: sol-gel method; carbothermal reduction; SiC-Al2O3; composite powder; microwave permittivity 1 Introduction Silicon carbide (SiC......
Complex Permittivity and Microwave Absorbing Property of Si3N4-SiC Composite CeramicGuopeng Zheng, Xiaowei Yin , Jie Wang, Mengluo Guo and Xi Wang Science and Technology on Thermostructure Composite... infiltration using porous Si3N4 ceramic as preform. The average grain size of SiC was 30 nm. Relationship between SiC content and relative complex permittivity of Si3N4-SiC within the frequency range......
. A novel phenomenon is discovered that the complex permittivity, complex permeability and electromagnetic loss tangent have suddenly a step change at a certain frequency and the step-change frequency... overcome higher energy barrier when the frequency of incident microwave reaches a certain value. Key words: microwave absorption material; complex permittivity; complex permeability; rare-earth Mn oxide......
are the key factors for the characteristics of the hollow fiber. Values of the complex permeability and permittivity are beneficial to improve the electromagnetic matching ability and microwave attenuation for the hollow fiber compared with the solid fiber.Key words:magnetic conductive hollow fiber; electromagnetic analysis; anisotropy; complex permeability; complex permittivity......
Trans. Nonferrous Met. Soc. China 22(2012) 354-359 Influence of pyrolytic carbon coatings on complex permittivity and microwave absorbing properties of Al2O3 fiber woven fabrics DING Dong-hai, ZHOU... characterized by SEM and Raman spectroscopy. The influence of deposition time of PyC on the DC conductivity (σd) of Al2O3 filaments and complex permittivity of fabrics at X band (8.2-12.4 GHz) were......
Complex permittivity, permeability, and microwave absorption of barium ferrite by citrate sol-gel processZHANG Haijun WU Mingzhong YAOXi and ZHANG Liangying1) High Temperature ceramics Institute..."><正> BaFe12O19 hexaferrites were prepared by citrate sol-gel process. The formation temperature was much lower than that of the conventional ceramic method. The complex dielectric constant......
their complex permittivity by rectangle wave guide method in the frequency range of 8.2-18 GHz. The results show that both real part ε′ and imaginary part ε″ of complex permittivity increase... to the increase in complex permittivity. Key words: silicon carbide ceramic; polycarbosilane derived SiC; dielectric properties; pyrolysis temperature; free carbon; complex permittivity 1 Introduction The needs......
STUDY ON PREPARATION, COMPLEX PERMITTIVITY,PERMEABILITY AND MICROWAVE PROPERTIES OF BaZnzCo2- zFe16O27/SiO2 MICROCRYSTALLINE GLASS CERAMICS L.Y.Zhang1,X.Yao1,X.L.Jia2,H.J.Zhang2 (1.Functional... microcrystalline glass ceramics with Z=0.0, 0.5, 0.8 and 1.1 were prepared at temperature 1200℃ for 5h by citrate sol-gel process. The complex dielectric constant and complex permeability......
of building blocks.Herein, mono-phase ceramics of indium tin oxides(ITO) were sintered for epsilon-negative materials in MHz-k Hz frequency regions. Electrical conductivity and complex permittivity were...Doped ceramics of indium oxides for negative permittivity materials in MHz-kHz frequency regionsGuohua Fan1,Zhongyang Wang1,Kai Sun2,Yao Liu1,Runhua Fan21. Key Laboratory for Liquid-Solid Structural......
the particle sizes milled are excessively small. Key words: microwave absorbing mechanism; complex permeability; complex permittivity; ball-milling time 1 Introduction With the high development... with prolonging of the ball-milling time from 3 h to 15 h. But the magnetic properties would become Fig.4 Complex permittivity after different milling times: (a) Real permittivity......
