Secondary phases could not be detected by XRD analysis due to the addition of 2.5 wt % of NiO.It assumed that the NiO addition in the grain boundary regions suppresses the grain growth during the sintering process, ensuing in a reduced densification of ceramic samples.With a further increase in the NiO content, εr swings in the same range.Moreover, the curie temperatures of BTO+NiO ceramics also show the same trend and the dielectric data of all samples. There are a range of ideas for explaining of the dielectric behaviors of NiO doped ceramic materials.Fig. 3 shows the comparison of pure BTO and 0.5, 1.5 and 2.5 wt % NiO added BaTiO3 ceramic sample which is sintered at 12800C. This XRD results provide intensity in the range of 200 to 900 2Theta for unwanted secondary phase identification. In pure BTO two twin peaks was found at 450 and 750 2Theta where the plane was (002) and (103). With the addition of various amounts of NiO nanoparticles the intensity is being narrow for doped ceramic sample.