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Using the solid-phase reaction method we obtained b ismuth ferrite based compounds generated by partial substitution of bismuth ions with rare earth metal ions (lanthanum and praseodymium). We used th ermogravimetric analysis and X-ray analysis at the temperature range from 29 7 to 1123 K to study the peculiarities of the processes of phase formation of reaction-products synthesis in the systems which contain oxides of iron, bismuth, lanthanum, and praseodymium; their compositions were also determined. For t he final synthesis temperature of 1123 K we determined a homogeneous concentr a ion area, where bismuth ferrite solid solutions with the structure of distorted perovskite exist. We studied the influence of lanthanum and praseodymium oxides on phase composition of bismuth ferrite compounds in the process of isovale nt alloying of a part of bismuth ions by lanthanum and praseodymium ions. In the frequency range of 20 Hz – 1 MHz we determined the key parameters, whi ch characterize electrical and magnetic properties of perovskite-like phases. We found that for the considered samples the frequency dependencies of complex magnetic permeability and electrical parameters (real and alleged part of per mittivity) are of almost the same type. We showed that for the given frequency r ange both electrical (complex permittivity) and magnetic (complex magnetic permeability) parameters decrease with the frequency increase.

FORMATION OF COMPOUNDS BASED ON BISMUTH FERRITE WITH PARTIAL SUBSTITUTION OF BISMUTH IONS BY LANTHANUM AND PRASEODYMIUM