en Research Paper Research Paper <div>&nbsp;&nbsp;&nbsp; The structural and dielectric properties of iron and bismuth co-substituted BaTiO₃ ceramic with the formula: B_0.95Bi_0.05Ti_1-xFe_xO₃ for x=0.00 to 1.00, synthesis with solid state route, were characterized.&nbsp;&nbsp;&nbsp;&nbsp; The X-ray diffraction results show a tetragonal phase for x=0.00. While for x=0.40 to 0.80 we observed a coexistence of tree phase tetragonal, hexagonal and pseudo-cubic. And at x=1.00 only the pseudo-cubic phase is present and the other phase disappeared. The Raman results indicate the existence of tetragonal band for x&le;0.40, and an appearance of characteristic bands of Fe³⁺ ions for more than 0.40 of Fe content. The SEM micrographs show an increase in grain size with the increase of Fe content and it reaches a maximum at x=0.40.&nbsp; And <a name="_Hlk60408451">the Mossbauer spectroscopy indicates that our samples is paramagnetic at room temperature and that the Fe is&nbsp;&nbsp; oxidized under Fe³⁺ with no existence of Fe²⁺ and Fe⁴⁺ ions</a>. The temperature dependence of dielectric permittivity was investigated in the frequency range from 20 Hz to 2MHz. <a name="_Hlk60408470">The results show three dielectric relaxation phase transitions from a rhombohedral ferroelectric to orthorhombic ferroelectric (T_R-O) then to a tetragonal ferroelectric phase (at T_O-T), and finally to cubic paraelectric at the Curie temperature (T_C). &nbsp;</a>In addition, the temperature of phase transition shifted to the lower temperature with the increase of Fe content for all the phase transitions. And the maximum of dielectric permittivity increases for T_R-Owhile for T_T-Oand T_mphases transitions, it reaches a maximum at x=0.60 and x=0.80 respectively and then decreases.</div> Structural,dielectric,BaTiO3,solid state,SEM,Mossbauer,paramagnetic,phase transition,curie temperature. 1 9 http://ijmse.iust.ac.ir/browse.php?a_code=A-10-3303-1&slc_lang=en&sid=1 Najwa Gouitaa najwa.gouitaa@gmail.com 1800319475328460014668 1800319475328460014668 Yes Signals, Systems and Components Laboratory (LSSC), Electrical Engineering Department, University Sidi Mohamed Ben Abdellah USMBA, FST. Fez, Imouzzer Road B.P. 2202, Morocco Lamcharfi Taj-dine 1800319475328460014669 1800319475328460014669 No Signals, Systems and Components Laboratory (LSSC), Electrical Engineering Department, University Sidi Mohamed Ben Abdellah USMBA, FST. Fez, Imouzzer Road B.P. 2202, Morocco Bouayad Lamfaddal 1800319475328460014670 1800319475328460014670 No Signals, Systems and Components Laboratory (LSSC), Electrical Engineering Department, University Sidi Mohamed Ben Abdellah USMBA, FST. Fez, Imouzzer Road B.P. 2202, Morocco Abdi Farid 1800319475328460014671 1800319475328460014671 No Signals, Systems and Components Laboratory (LSSC), Electrical Engineering Department, University Sidi Mohamed Ben Abdellah USMBA, FST. Fez, Imouzzer Road B.P. 2202, Morocco Mohamed Ounacer 1800319475328460014672 1800319475328460014672 No Physic of Materials Laboratory, FST, University Sultan Moulay Slimane, BP 523,23000, Beni-Mellal, Morocco Mohammed Sajieddine 1800319475328460014673 1800319475328460014673 No Physic of Materials Laboratory, FST, University Sultan Moulay Slimane, BP 523,23000, Beni-Mellal, Morocco