Maxwell–Wagner relaxation and magnetodielectric properties of Bi$_{0.5}$La$_{0.5}$MnO$_{3}$ ceramics

The complex permittivity $\varepsilon=\varepsilon'-i\varepsilon''$ of manganite bismuth–lanthanum Bi$_{0.5}$La$_{0.5}$MnO$_{3}$ ceramics has been measured at temperature $T$ = 78 K in the frequency range $f$ = 200–10$^{5}$ Hz and in the magnetic induction range $B$ = 0–5 T. Dielectric relaxation and the pronounced magnetodielectric effect have been detected. The explanation based on the superposition of Maxwell–Wagner relaxation and the magnetoresistance effect has been proposed.