▎ 摘　　要

The dielectric ceramics are being applied in microwave communication systems, among them barium magnesium niobates Ba(Mg1/3Nb2/3)O-3 (BMN) are gaining much popularity. In this work, the BMN perovskite ceramic powders are conveniently afforded via calcination and developed into porous ceramic pellets. The low pressure compaction and intermediate temperature sintering is utilized for the development, both factors leading to an energy economization approach. Thermo-analytical, morphological and quantitative B-site order parameter studies are carried out for freshly synthesized pure BMN ceramics. Dielectric properties (over the range of 0-1 GHz) of pure BMN pellet, their dependence on micron size silica and graphene oxide contents are extensively studied by network analyser. Graphene oxide is first time added in the niobate ceramic, prepared by the modified Hummers method. Increase of silica content (0-2%) is found to be directly proportional to sinter-ability of BMN powder, and in turn, results in improved quality factor and dielectric constant. Graphene oxide greatly enhances sinter-ability and, with being conducting nature, exhibits an unusual increase in permittivity of the sample having 0.25% graphene oxide.