Structure property relations in BiFeO3/BaTiO3 solid solutions

${\mathrm{BiFeO}}_3,$ when forming a solid solution with ${\mathrm{BaTiO}}_3,$ shows structural transformations over the entire compositional range. Above 70 mole % of ${\mathrm{BiFeO}}_3$ the structure is rhombohedral and below 4 mole %, it is tetragonal. In between the structure is cubic. The ferroelectric $T_C$ decreases with increasing composition of ${\mathrm{BaTiO}}_3$ and a relatively small relaxation is observed. Impedance measurements showed a structural dependence and analysis of which has clearly shown that the capacitance observed is from the bulk of the sample. Relaxation time (τ) of ${\mathrm{BiFeO}}_3$ was estimated using the relaxation times of the intermediate compositions. Magnetization measurements showed field induced ferromagnetism. As the structure becomes cubic with increasing concentration of ${\mathrm{BaTiO}}_3,$ paramagnetism sets in, as evidenced by the electron spin resonance spectra.