Effect of mechanical alloying synthesis process on the dielectric properties of (Bi0.5Na0.5)0.94Ba0.06TiO3 piezoceramics

• MA samples show higher dielectric permittivity and Curie temperature.
• In MA samples, dielectric loss is almost 27% less than conventional ones.
• In MA samples, sintering time and temperature are lower than conventional ones.
• In MA samples, particle morphology is more homogeneous conventional ones.
• In MA samples, crystallite size is smaller conventional ones.

In present work, in order to study the effects of synthesis techniques on dielectric properties, the BNBT lead-free piezoceramics with (Bi0.5Na0.5)0.94Ba0.06TiO3 stoichiometry (called as BNBT6) were synthesized by mechanical alloying (MA) and conventional mixed oxides methods. The structural, microstructural, and dielectric properties were carried out by X-ray diffractometer (XRD), scanning electron microscope (SEM), and impedance analyzer LCR meter, respectively. Based on results, the density of MA samples is considerably higher than conventional samples owning to smaller particles size and more uniformity of particle shape of MA samples. Moreover, the dielectric properties of MA samples are comparatively improved in which the dielectric loss of these samples is almost 27% less than conventional ones. Furthermore, MA samples exhibit obviously higher dielectric permittivity and Curie temperature compared to the conventional samples.

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