Effect of La Dopant in Modified Bismuth Ferrite Ceramics

The La modified bismuth ferrite perovskite Bi0.6La0.4FeO3 (BLF) is prepared by cost-effective high solid-solution casting technique. Formation of composite checked through X-ray diffraction and also notable that there phase transition from rhombohedral (R3c) to orthorhombic (Pbnm). average crystalline size (DSC) mechanical lattice strain are 63.8 nm 0.147% respectively as calculated Williamson-Hall method. frequency bands corresponding Bi-O, LaO, FeO stretching vibration confirm +3 ions completely incorporate the Bi in A-site single perovskite. SEM micrograph suggests sample has distinct grains well-defined grain boundaries (DSEM) about 13.9 μm. rate agglomeration acquire (DSEM/ DSC = 219) confirms excellent connectivity which stands possible reason for dielectric conductivity. impedance analysis provided fact bulk resistance (Rb) decreases 6.662 x 10 5 Ω at 25 0 C 1.000 -2 350 C; suggesting NTCR behaviour material. activation energy increases 201 meV 677meV with temperature supports a thermally activated conduction mechanism. relaxation process controlled immobile charge carriers lower range while defects higher temperatures presence hopping gap between peak becoming wide non-Debye type character. semicircular arcs both Nyquist plots Cole-Cole confirming semiconductor nature.