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Composition-driven structural transitions in Bi1-xCaxFe1-xMnxO3 ceramicsprepared by the tartaric acid modified sol-gel technique have been studied toanalyze its effect on the magnetic properties of bismuth ferrite (BiFeO3). Itwas observed that the co-substitution of Ca & Mn at Bi & Fe sites in BiFeO3(BFO) significantly suppress the impurity phases. The quantitativecrystallographic phase analysis has been carried out by double phase Rietveldanalysis of all the XRD patterns which indicates the existence of compositionaldriven crystal structure transformation from rhombohederal (R3c space group,lower crystal symmetry) to the orthorhombic (Pbnm space group, higher crystalsymmetry) with the increase in substitution concentration due to excesschemical pressure (lattice strain). Magnetic measurements reveal thatco-substituted BFO nanoparticles for x = 0.15 have enhanced remnantmagnetization about 14 times that of pure one due to the suppression of cycloidspin structure which could be explained in terms of field induced spinreorientation and weak ferromagnetism. However, at the morphological phaseboundary (x = 0.15), the remnant and maximum magnetization at 8 T reaches amaximum which indicates almost broken spin cycloid structure and furtherincrease in substitution results in the reduction of both magnetizations due tothe appearance of complete antiferromagnetic ordering in the orthorhombicstructure because of the significant contribution from the crystallographicphase of Pbnm space group (as obtained from double phase Rietveld analysis).

Effect of Structural Transition on Magnetic Properties of Ca and Mn co-substituted BiFeO3 Ceramics