Effect of intensive mechanical activation on dielectric and magnetic properties of barium titanite

The effect of mechanical action (pressing plus shear, PPS) on the dielectric permittivity $(\varepsilon)$ and magnetic response of nanocrystalline barium titanate was studied. A noticeable increase in the saturation magnetization of the material as a result of PPS was found, which is associated with an increase in the dislocation density. Annealing at a temperature of 1300$^\circ$C of the original and PPS-treated samples leads to a significant increase in $\varepsilon$. However, the dielectric permittivity of the treated sample is lower in comparison with the initial one, which indicates a higher concentration of lattice defects in it.