INFLUENCE OF MIXING AND THERMAL PARAMETERS ON THE STRUCTURAL HOMOGENEITY AND DIELECTRIC PERFORMANCE OF NBT CERAMICS
DOI:
https://doi.org/10.11113/jurnalteknologi.v88.24729Keywords:
Sodium Bismuth Titanate (NBT), Solid state reaction method, structural, dielectric propertiesAbstract
Sodium Bismuth Titanate (Na₀.₅Bi₀.₅TiO₃, NBT) is a promising lead-free ferroelectric materials, but the role of processing parameters on its structural and dielectric performance is not well understood. This study investigates the impact of four different mixing methods: no ball milling, mixing and milling, moderate mixing and milling, and short-intensity mixing, on the properties of NBT ceramics synthesized by solid-state reaction and sintered at 1150 °C. The results show that enhanced mixing improves phase purity and structural uniformity. Notably, short-intensity mixing yields ceramics with sharp X-ray diffraction peaks of the rhombohedral R3c phase and high relative densities (73 - 91%). These features are associated with excellent dielectric properties, including high permittivity (2000 - 6000 at 1 kHz, 300 °C) and a stable Curie temperature (320 °C). This study highlights the importance of mixing conditions in optimizing the structure–property relationship of NBT ceramics and offers practical guidelines for processing high-performance lead-free ferroelectric devices.
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