The influence of different processing parameters and various Ba²⁺ addition (up to 10 mol%) on the structure and dielectric properties of Bi_0.5Na_0.5TiO₃-BaTiO₃ (BNT-BT) ceramics was investigated. The powders were hydrothermally synthesized in alkaline environment at 180 °C for different time periods. X-ray diffraction confirmed the presence of dominant rhombohedral Bi_0.5Na_0.5TiO₃ phase and a small amount of secondary pyrochlore Bi₂Ti₂O₇ phase in the pure BNT powders. In addition, one-dimensional Na₂Ti₂O₇ structure was also observed in the powder hydrothermally treated for a long time (i.e. 48 h). The amount of secondary pyrochlore phase in the BNT-BT powders increases with the increase of Ba²⁺ content. The synthesized powders were pressed into pellets and finally sintered at various temperatures up to 1150 °C. High density (more than 90 %TD) was obtained in all BNT-BT sintered samples. Optimal sintering parameters were chosen in order to obtain dense ceramics with the optimal phase composition. The temperature dependence of dielectric properties for the BNT-BT ceramics was also studied. Relaxor behavior of BNT based ceramics and broad transition peaks are evident in all samples. Dielectric constant up to 400 as well as acceptable low dielectric loss at temperatures lower than 200 °C were obtained in BNT-BT ceramics.

Datasets include XRD, Raman and dielectric measurements. All data is extracted from original instrumental files and collected in Excell files. Dielectric data is calculated from LCR meter results.

Few missing values are not presented in dielectric datasets for some samples since there were mesurement glitches at the highest measuring temperatures.