Ultra‐low Sintering Temperature Microwave Dielectric Ceramics Based on Na2O‐MoO3 Binary System |
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| Authors: | Gao‐qun Zhang Hong Wang Jing Guo Li He Dan‐dan Wei Qi‐bin Yuan |
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| Affiliation: | Electronic Materials Research Laboratory, Key Laboratory of the Ministry of Education and International Center for Dielectric Research, Xi'an Jiaotong University, Xi'an, China |
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| Abstract: | The compounds in Na2O‐MoO3 system were prepared by the solid‐state reaction route. The phase composition, crystal structures, microstructures, and microwave dielectric properties of the compounds have been investigated. This series of compounds can be sintered well at ultra‐low temperatures of 505°C–660°C. The sintered samples exhibit good microwave dielectric properties, with the relative permittivities (εr) of 4.1–12.9, the Q × f values of 19900–62400 GHz, and the τf values of ?115 ppm/°C to ?57 ppm/°C. Among the eight compounds in this binary system, three kinds of single‐phase ceramics, namely Na2MoO4, Na2Mo2O7 and Na6Mo11O36 were formed. Furthermore, the relationship between the structure and the microwave dielectric properties in this system has been discussed. The average NaI‐O and MoVI‐O bond valences have an influence on the sintering temperatures in Na2O‐MoO3 system. The large valence deviations of Na and Mo lead to a large temperature coefficient of resonant frequency. The X‐ray diffraction and backscattered electron image results show that Na2MoO4 doesn't react with Ag and Al at 660°C. Also, Na2Mo2O7 has a chemical compatibility with Al at 575°C. |
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