Abstract
The effects of Dy₂O₃ and Er₂O₃ co-doping on electrical properties and temperature stability of barium titanate (BaTiO₃) ceramics were investigated in terms of microstructure and structural analysis. The dielectric constant and the insulation resistance (IR) of 0.7 ㏖% Dy₂O₃ and 0.3 ㏖% Er₂O₃ co-doped dielectrics had about 60% and 20% higher than the values of undoped one, respectively, and the temperature coefficient of capacitance (TCC) met the X7R specification. The addition of Dy₂O₃ contributed to electrical properties caused by increase of tetragonality; however, preferential diffusion of Dy³? ions toward A site in BaTiO₃ grain exhibited an adverse effect on temperature stability by grain growth. On the other hand, The Er₂O₃ addition in BaTiO₃ could affect the TCC behavior and the IR with suppression of grain growth caused by reinforcement of grain boundary and electrical compensation. Therefore, the enhanced electrical properties and temperature stability through the co-doping could be deduced from the increase of tetragonality and the suppression of grain growth.
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