1 Department of Information Engineering, Shaoyang University, Shaoyang 422000; 2 School of Energy Science and Engineering, University of Electronic Science and Technology of China, Chengdu 611731
Abstract: The structure and microwave dielectric properties of Ba(Mg1/3Nb2/3)O3 (BMN) ceramics doped with x(x=0-8)wt% SnO2 (BMSN) were investigated by the solid-state reaction technique. XRD analysis suggested there were two phases: main crystalline phase Ba(Mg1/3Nb2/3)O3 and secondary phase Ba5Nb4O15. As x value increased, the crystal structure changed from pe-rovskite hexagonal structure to cubic structure and the ordered phase changed from 1∶2 ordered structure to 1∶1 ordered structure. It was found that the liquid phase sintering can be promoted greatly by adding an appropriate amount of SnO2. When 6wt% SnO2 was added, the BMN ceramic showed a lower sintering temperature (1 550 ℃) compared to pure BMN (1 200 ℃), an apparent density ρ of 6.39 g/cm3, a relative theoretical density of 99.1%, also excellent microwave dielectric properties: high relative dielectric constant(εr= 33.6), near-zero temperature coefficient of resonant frequency value τf=0.15×10-6℃-1, high quality factor plus resonant frequency (Q·f=112 300 GHz (8 GHz)).
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2017, Vol. 31 
