Abstract
The effects of tetragonality and secondary phase on the Curie point of barium titanate (BaTiO3) ceramics were investigated in BaTiO3–MnNb2O6 system using differential scanning calorimetry (DSC), X-ray diffraction (XRD) and scanning electron microscope (SEM). In the case of MnNb2O6 addition up to 0.50 mol%, the Curie point decreased as the room temperature tetragonality decreased. With MnNb2O6 content greater than 1.00 mol%, a secondary phase Ba2Ti3Nb4O18 was formed, resulting in a shift of the Curie point towards higher temperatures. The chemical defect reaction and the internal stress effect on the Curie point have also been discussed.
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