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- W2296775516 abstract "BaTiO3-based PTC ceramics were prepared by solid-phase method with different concentration of silicon. Samples were characterized by X-ray diffraction (XRD) and scan electron microscope (SEM), and the influences of concentration of silicon and the secondary phase of Ba2TiSi2O8 on electric properties of PTC ceramics were investigated. The results show that doping with a small quantity of silicon can reduce the room temperature resistivity (ρ25) of PTC ceramics. Silicon is favorable to mass transfer and the limitation of movement of grain boundary. When the concentration of silicon is no more than 0.5 mol%, temperature coefficient of resistance (a25) and ratio of maximum resistance to minimum (η=R(subscript max)/R(subscript min)) increase as the concentration of silicon increased. Besides acting as a sintering aid, silicon can also change the formation of the grain boundary. While the concentration of silicon is more than 0.5 mol%, a secondary phase of Ba2TiSi2O8 appears. As the concentration of silicon increase further, the secondary phase of Ba2 TiSi208, room temperature resistivity and ratio of maximum resistance to the minimum increase, but temperature coefficient of resistance decreases. The secondary phase of Ba2 TiSi2 08 leads to a diffuse PTC behavior." @default.
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- W2296775516 date "2008-06-25" @default.
- W2296775516 modified "2023-09-27" @default.
- W2296775516 title "Influence of Silicon on Phase Formation, Microstructure and Properties of PTC Ceramics" @default.
- W2296775516 hasPublicationYear "2008" @default.
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