Abstract
ABSTRACTThe crystallization kinetics of 0.5 (Ba0.85 Ca0.15) TiO3−0.5 Ba (Zr0.1 Ti0.9) O3 (BCZT) powders, synthesized using conventional solid-state reaction, was investigated by differential scanning calorimetry (DSC) in both non-isothermal and isothermal conditions. In non-isothermal mode, the samples were heated from room temperature to ∼1200°C at various heating rates (2.5, 5, 10 and 15°C/min). In isothermal mode, the powders were firstly heated to 823,833 and 838°C and maintained at those temperatures until complete crystallization. The X-ray diffraction analysis (XRD) confirmed the formation of single perovskite phase. The kinetic parameters of the crystallization of BCZT powders were determined using model-free methods. The application of Johnson–Mehl–Avrami model yields a growth index of 0.5 and an average value of avrami exponent of 2.5, indicating a growth of BCZT particles by diffusion-controlled mechanism with a constant nucleation rate.
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