The influence of cubic and tetragonal systems of nano-sized ceramic barium titanate powder on hemolytic activity, free radical processes and antioxidant activity was studied. The physicochemical properties of BaTiO3 obtained by heat treatment in air at 800°C and 1200°C of the precursor synthesized by the sol-gel method were investigated. Based on X-ray phase analysis in conjunction with Raman spectra and heat capacity measurements, it was found that the crystal structure of BaTiO3 calcined at 1200°C is a tetragonal crystal system, while that of BaTiO3 calcined at 800°C is a cubic crystal system. The analysis of the scanning electron microscopy method in combination with the dynamic light scattering method showed a distribution of nanosized particles from 50 to 250 nm for BaTiO3 at 800°C and from 100 nm to 240 nm at 1200°C. Depending on the processing temperature, the powders were found to have different pore sizes: at 800°C - micropores and at 1200°C - mesopores.
