Low temperature sintered of Ba 3 MgNb 2 O 9 ceramics with high quality factor via B-site oxide precursor method
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Low temperature sintered of Ba3MgNb2O9 ceramics with high quality factor via B-site oxide precursor method He Wang1, Renli Fu1,*
, Xuhai Liu2, Yue Xu3, and Yunan Liu1
1
College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, People’s Republic of China 2 College of Microtechnology & Nanotechnology, Qingdao University, Qingdao 266071, People’s Republic of China 3 Key Laboratory of Processing and Testing Technology of Glass & Functional Ceramics of Shandong Province, School of Materials Science and Engineering, Qilu University of Technology (Shandong Academy of Sciences), Jinan, People’s Republic of China
Received: 10 August 2020
ABSTRACT
Accepted: 23 September 2020
B-site oxide precursor method was utilized to synthesize Ba3MgNb2O9 ceramics. The effects of sintering temperature on phase composition of Ba3MgNb2O9 ceramics was evaluated by the X-ray diffraction. Experimental results indicated that all prepared Ba3MgNb2O9 ceramics exhibited 1:2 ordered hexagonal structure. The second phase Ba5Nb4O15 can emerge in all ceramics due to the decrease of activation energy of reaction, leading to the splitting of Eg(O) vibration mode in the Raman spectra. In addition, lattice parameters of 1:2 ordered phase were obtained from the refinement of XRD patterns. The maximum value of c/a ratio occurred at 1475 C, meanwhile the ceramics showed the highest 1:2 ordered degree and excellent Q 9 f. It was also found that the uniform grain-size distribution of Ba3MgNb2O9 powder were important factors for preparing dense Ba3MgNb2O9 ceramics. Moreover, B-site oxide precursor method can not only effectively lower the densification temperature from 1650 to 1475 C, but also increase the quality factor (Q 9 f) by about 90.8%, i.e., from 55,277 to 105,467 GHz.
Springer Science+Business
Media, LLC, part of Springer Nature 2020
1 Introduction With the advent of 5G communication, the wireless network tends to be more diversiform, integrative and intelligent. Massive Multiple-input Multipleoutput (M-MIMO) wireless communication system is paramount in advanced 5G mobile communication
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https://doi.org/10.1007/s10854-020-04544-8
[1], which can result in communication nodes ten times faster compared with the conventional base stations. With multiple transmitter and receiver by the antennas in M-MIMO system, the communication quality can be effectively improved [2]. However, more antennas can increase the weight and volume of base stations. In order to solve this problem, the
J Mater Sci: Mater Electron
application of microwave dielectric ceramic filter in 5G communication base station has been widely concerned, because the weight and volume of microwave dielectric ceramic filter can be effectively miniaturized compared with the conventional spatial precision filter [3]. Therefore, to minimize the M-MIMO system, the dielectric ceramics filter is indispensable in the field of microwave communication. To ensure excellent freque
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