The Li2O–Nb2O5–TiO2 Composite Microwave Dielectric Ceramics with Adjustable Permittivities |
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| Authors: | Qun Zeng Wei Li Jian-lin Shi Xian-lin Dong Jing-kun Guo |
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| Affiliation: | Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China;
Graduate School of Chinese Academy of Science, Beijing 100039, China;
Key Laboratory for Ultrafine Materials of Ministry of Education, School of Materials Science and Engineering, East China University of Science and Technology, Shanghai 200237, China |
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| Abstract: | A group of new y M-phase/(1? y ) Li2+ x Ti1?4 x Nb3 x O3 composite ceramics with adjustable permittivities for low-temperature co-fired ceramic applications was initially investigated in the study. The 0.5 M-phase/0.5 Li2+ x Ti1?4 x Nb3 x O3 ( x =0.01, 0.02, 0.04, 0.06, 0.081) composite ceramics were first investigated to find the appropriate "Li2TiO3ss" composition ( x value). The best dielectric properties of ?r=40.1, Q × f values up to 9318 GHz, τf=25 ppm/°C, were obtained for the ceramics composites at x =0.02. Based on the good dielectric properties, the suitable "Li2TiO3ss" composition with x =0.02 was mixed with the Li1.0Nb0.6Ti0.5O3 powder as the ratio of y "M-phase"/(1? y ) "Li2TiO3ss" ( y =0.2, 0.4, 0.5, 0.6, 0.8). By adjusting the y values, the group of composite ceramics could exhibit largely are adjustable permittivities varying from ～20 to ～60, while Q × f and τf values relatively good. Nevertheless, in this study, because there are interactions between the M-phase and Li2TiO3ss during sintering process, their microwave dielectric properties could not be predicted precisely by the empirical model. |
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