Influence of bismuth on the magnetic and electrical properties of La₂MnNiO₆ .IAEA.ATOMS

In this study, we report the ambient pressure and low temperature synthesis of ordered perovskite La_2−xBi_xMn_1+yNi_1−yO₆ with high bismuth content. Keeping y=0, we are able to substitute La by Bi up to x=0.4 i.e. 20% of La. However, 50% La could be replaced by Bi for y=0.5 without any impurity phases. Interestingly, these compounds remain ferromagnetic with the Curie temperature T_C of 255 and 75 K for La_1.6Bi_0.4MnNiO₆ and LaBiMn_1.5Ni_0.5O₆ compositions, respectively. Moreover, these Bi-substituted phases become more conducting, three order of magnitude higher, at room temperature compared to the parent La₂MnNiO₆ phase. - Highlights: • Synthesis of bismuth based perovskite at ambient pressure and low temperature with 50% Bi-doped phase. • Magnetic interactions between Mn and Ni ions have been proposed clearly for the doped phases • The band gap energy in the samples have been determined to explain their higher conductivity