[en] Multiferroic nanoceramics BiFe_1-xNi_xO₃ (where x=0, 0.15, 0.20, and 0.25) were prepared by the sol-gel method. XRD analysis of samples calcined at a low temperature of 400 deg. C for 2 h shows the formation of a single phase perovskite rhombohedral structure. Average particle size was observed to be ∼50 nm by TEM measurement. Magnetization was found to increase with increase in the concentration of Ni. Dielectric constant and dielectric loss were measured up to 1 MHz frequency. Variation of dielectric constant with temperature shows a peak at ∼395 deg. C (Neel temperature) for x=0.15 and the peak shifts towards lower temperature at a higher concentration of Ni with diffused type of phase transition. Magnetocapacitance was found to decrease with magnetic field. For BiFe_1-xNi_xO₃ (with x=0.15, 0.20, 0.25) nanoceramics, the fractional change of the magnetic field induced a change in the dielectric constant, which may well be approximated by Δε/ε=γM², (where γ (magnetoelectric interaction ) is small and negative). A linear fit gave the value of γ of ∼-2.14x10^-3, -2.11x10^-3, and -2.09x10^-3 for BiFe_1-xNi_xO₃ nanoceramics, with x=0.15, 0.20, and 0.25, respectively.