Abstract
Nickel is now frequently used as internal electrodes for multilayer ceramic capacitors (MLCC). In order to evaluate the effect of the presence of metallic Ni on the properties of BaTiO3-based dielectrics, nano-sized Ni particles are mixed thoroughly with BaTiO3 powder and subsequently sintered at 1,330 °C in nitrogen. The oxygen partial pressure in the nitrogen is slightly higher than the equilibrium oxygen partial pressure for the Ni→NiO reaction. Under such a condition, an upper limit of 5,400 ± 540 ppm for the solubility of Ni in BaTiO3 is detected. The Ni solute acts as an acceptor to BaTiO3, and its presence increases the reduction resistance of BaTiO3 significantly.
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