This paper reports on the synthesis of polycrystalline (Li,Ti)-doped NiO powders (i.e., LixTi0.1Ni1xO,
abbreviated as LTNO) by the solid-state synthesis method. Note that, the doping concentration of Ti is
kept constant (x~0.10) in the stoichiometry, the difference in the material behavior of LTNO samples can
only be attributed to the effect of Li. X-ray diffraction patterns confirmed a cubic rock-salt structured NiObased
phase with the presence of minor NiTiO3 phase, were reported elsewhere [Venkata et al., Chem.
Phys. Lett., 649 (2016) 115e118.]. Dense microstructures were obtained using ultra high resolution
scanning electron microscope. A high dielectric constant (ƒÃ~104) near room temperature at lowfrequency
was observed in LTNO ceramics. Weak temperature dependence of dielectric constant over
the measured compositions (x . 0 to 0.10) was observed in the LTNO ceramics. A giant dielectric constant
of 104e105 at high temperatures (120e170 C) for certain LTNO compositions (x . 0.15 to 0.3) was
observed in the sintered ceramics. The origin of the high dielectric constant observed in these LTNO
ceramics is attributed to the MaxwelleWagner polarization mechanism and a thermally activated
mechanism.