Abstract
The Positive Temperature Coefficient of Resistivity (PTCR) behavior in barium titanate has been investigated as a function of processing variables, such as Nb 2O 5 dopant and KCl flux in the molten salt synthesis. As the amount of Nb 2O 5 dopant increases over the solubility limit in BaTiO 3, the room temperature resistivity increases and the PTCR effect and the grain size decrease. Variation of the amount of KCl flux only slightly influences the room temperature resistivity, PTCR effect and grain size in Nb 2O 5 doped BaTiO 3, but BaTiO 3 ceramics prepared by the method of molten salt synthesis show a large PTCR effect than those prepared by conventional calcining of mixed oxides. These results suggest a role for a defect mechanism and a grain boundary effect.
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