The layered BaCa$_4$Nb$_4$TiO$_{17}$ perovskite ceramic was synthesized via conventional solid state mixed oxide sintering process. The material was sintered in a range of 1375$^{\circ}$C to 1500$^{\circ}$C for 4~h to develop dense ceramic. Relative density of 97\% was achieved while sintering at 1450$^{\circ}$C for 4~h. The XRD data analysis confirmed single phase layered perovskite and the microstructure comprised well-connected plate-like grains with an average grain size of $\sim$5.46~$\mu$m as determined by ImageJ software. The material offers a good combination of microwave dielectric properties such as $\varepsilon_r \sim 57$, $Q_{uf} \sim 9500$~GHz and $\tau_f \sim 30$~ppm/$^{\circ}$... More >

In the present study, Na$_{0.329}$Bi$_{0.329}$Ba$_{0.042}$Sr$_{0.30}$TiO$_3$ (NBBST) and its solid solutions with Nd(Mg$_{0.5}$Ti$_{0.5}$)O$_3$ (NMT), Nd(Mg$_{2/3}$Nb$_{1/3}$)O$_3$ (NMN), and Nd(Zn$_{2/3}$Nb$_{1/3}$)O$_3$ (NZN) were synthesized and investigated. The phase composition, microstructure, dielectric properties, and impedance characteristics were analyzed for their optimized dense sintered forms. X-ray diffraction (XRD) confirmed the formation of a single-phase perovskite structure in all compositions within the detection limit. All ceramics exhibited dense microstructures; however, the doped samples showed a reduced average grain size compared to pure NBBST. Among the composition... More >

In this study, ceramics in the 0.90Na$_{0.5}$Bi$_{0.5-x}$La$_{x}$TiO$_{3}$--0.03NaNbO$_{3}$ --0.07 Ba(Zr$_{0.2}$ Ti$_{0.8}$)O$_{3}$ series (where $x = 0.00, 0.03,$ $ 0.05, 0.07$) were processed via a solid-state reaction method. The phase, microstructural features, and dielectric properties, particularly the dielectric constant and dielectric loss, were studied using X-ray diffraction (XRD), scanning electron microscopy (SEM), and dielectric spectroscopic techniques, respectively. XRD analysis revealed a single perovskite phase, while SEM analysis showed a dense microstructure with reduced grain size as the $x$ content increased. The increase in doping content enhanced the relaxor characteri... More >