Abstract
ABSTRACTThe AC complex impedance spectroscopy technique has been used to characterize electrical parameters of polycrystalline sample of (1-x-y)Bi0.5Na0.5TiO3–xBi0.5K0.5TiO3–yBi0.5Li0.5TiO3 (0.90-xBNT-xBKT-0.10BLT and 0.80-yBNT-0.20BKT-yBLT) lead-free ferroelectric ceramics with 0.18 ≤ x ≤ 0.26 and 0 ≤ y ≤ 0.12 in a wide frequency range at different temperatures. These samples were prepared by combustion technique. The crushing sintered pellets exhibited pseudocubic symmetry in all the samples. Impedance measurement on 0.90-xBNT-xBKT-0.10BLT and 0.80-yBNT-0.20BKT-yBLT in the temperature range of 470–560°C as a function of frequency has been analyzed. The bulk resistivity of ceramics decrease with increase temperature similar to semiconductor, and the Cole-Cole (Nyquist) plot presented negative temperature coefficient of resistance (NTCR). The activation energies of bulk and grain boundary for composition addition of BKT(x) and BLT (y) ceramics were found to be ∼ 0.5–0.7 eV, which suggested a conduction mechanisms dominated by extrinsic defects.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
