Abstract
Influence of Mg and Mn doping on structure and microwave dielectric properties of Ba(Co1/3Nb2/3)O3 (BCN) ceramics with complex perovskite structure is investigated systematically. X-ray diffraction and Raman spectrum investigations show that doping Mg and Mn into BCN ceramics is helpful for improving the quality factor (Q · f value) resulted from enhanced B-site 1:2 ordering degree. Mg- doped samples show higher ordering degrees and larger Q · f values than Mn- doped counterparts. The sintering density, grain size, 1:2 B-site ordering structure and microwave dielectric properties of BCN ceramics show a strong dependence on Mg and Mn doping content. The sintering density of BCN ceramics can be increased significantly by doping a small amount of Mg and Mn. However, further increase in doping content results in the decrease of sintering density. τf value of BCN ceramics can be tailored by doping of Mg into Co sites. The near-zero τf value (∼0.64 ppm °C−1) is obtained when the Mg doping content is at x = 0.1. The ordering degree and Q · f value of Mg- and Mn- doped BCN ceramics increase significantly with increasing annealing time.
Published Version
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