Sintering characteristics, crystal structure and dielectric properties of cobalt-tungsten doped molybdate-based ceramics at microwave frequency  

作　　者：Jian Bao Yuping Zhang Haitao Wu Yuanyuan Zhou Zhenxing Yue 

机构地区：[1]School of Environmental and Material Engineering,Yantai University,Yantai,264005,Shandong,China [2]School of Materials Science and Engineering,University of Jinan,Jinan,250022,Shandong,China [3]State Key Laboratory of New Ceramics and Fine Processing,School of Materials Science and Engineering,Tsinghua University,Beijing,100084,China

出　　处：《Journal of Materiomics》2022年第5期949-957,共9页无机材料学学报（英文）

基　　金：This work was supported by the National Natural Science Foundation of China(No.51972143,51872119);This project is supported by State Key Laboratory of New Ceramic and Fine Processing Tsinghua University(No.KFZD202101).

摘　　要：In this study,a sequence of Ce_(2)[Zr_(1-x)(Co_(1/2)W_(1/2))_(x)]_(3)(MoO_(4))_(9)(CZ_(1-x)(CW)_(x)M)(x=0.02e0.10)ceramics with excellent microwave dielectric properties were obtained by the traditional solid-phase method.The crystal structure,dielectric properties,and chemical bond characters of the ceramics were characterized and analyzed.X-ray diffraction and Rietveld refinement analysis show that CZ_(1-x)(CW)_(x)M could form a single-phase of the triangular crystal system in the entire doping range.The microstructure of the ceramic samples was obtained by scanning electron microscopy.The sintering temperature was reduced and the gain of the sample was refined as the increase of doping ion content.Furthermore,the intrinsic factors affecting the properties of CZ_(1-x)(CW)_(x)M were analyzed by employing P-V-L theory and through in-depth infrared analysis.When x was 0.04 and the sintering temperature was 750C,the best dielectric properties of the samples were achieved,includingεr=9.95,Q·f=80,803 GHz(at 9.99 GHz),and tf=-9.10 ppm/℃.

关 键 词：Ce_(2)[Zr_(1-x)(Co_(1/2)W_(1/2))_(x)]_(3)(MoO_(4))_(9) Rietveld refinement P-V-L theory Infrared analysis 

分 类 号：TQ174.1[化学工程—陶瓷工业]