Phase formation, microstructure and dielectric properties of Bi0.5(Na0.74K0.16Li0.10)0.5TiO3-Ba(Zr0.5Ti0.95)O3 ceramics prepared via combustion technique

Binary lead free electroceramics with the composition of (1-x)Bi-0.5(Na0.74K0.16Li0.10)(0.5)TiO3-x (BaZr0.05Ti0.95)O-3 or BNKLT-100xBZT with 0.025 <= x <= 0.150 were synthesised via the combustion technique. The results showed how BZT content affects typical properties of a BNKLT-100xBZT system such as phase formation and dielectric properties. The XRD investigation revealed that BNKLT-100xBZT exhibits the coexistence of rhombohedral and tetragonal phases. By adding BZT, the rhombohedral phase decreases and tetragonal phase increases. From a dielectric properties investigation, BNKLT-100xBZT shows two dielectric loss peaks at similar to 190 and similar to 320 degrees C defined as T-d and T-m respectively. Increasing the BZT fraction makes T-m shift to a lower temperature but has no effect on the T-d shifting. The maximum epsilon(r) and epsilon(max) with their respective values of 1380 and 4050 are observed from the sample with the composition BNKLT-5BZT, which can be attributed to its location near the MPB region.