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Here we report synthesis, structure, microstructure and magnetic properties of LaBiMnNiO(x = 0 and 1) double perovskites. Ricciardo et al. [ Mater. Res. Bull. 44 (2009) 239] have attempted to synthesized LaBiMnNiO(x= 1), but no further characterization was done due to large impurity content in the sample. We have been able to synthesize pure LaBiMnNiOphase at ambient pressure with traces of impurity at 750 ⁰C using sol-gel method. This achievement leads us to compare the structural and magnetic properties of LaBiMnNiOwith parent phase LaMnNiOto highlight the effect of Bi-doping in double perovskite. In contrast to the biphasic rhombohedral (R-3c) and monoclinic (P2/n) crystal structures of LaMnNiO, LaBiMnNiOcrystallized in single monoclinic (P2/n) phase. The EDX mapping confirmed the chemical homogeneity of the samples. The electron diffraction confirms the ordered structure of the sample. The microstructure analysis from HAADF-STEM revealed random distribution of misfit dislocations in the structure. Such defects are created to relax the strain due to unusual replacement of Mn/Ni atoms by La/Bi. We observed a decrease in Twith a large increase in magnetic moment of LaBiMnNiOcompare to La2MnNiO. There is also large suppression of low-temperature magnetic anomaly in Bi-substituted sample. The lowering of TC can be rationalized to the local structural distortion associated with the stereoactive 6s-lone pair electron of Bi. On the other hand, the increase in magnetic moment and suppression of low-temperature magnetic anomaly for LaBiMnNiOcan be ascribed to the suppression of antisite disorder in Bi-substituted sample.
This article was published in the following journal.
Name: Journal of physics. Condensed matter : an Institute of Physics journal
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