Abstract
As a candidate for lead-free positive temperature coefficient of resistivity (PTCR) ceramics, BaTiO3 (BT) ceramics with different Bi-based compounds (K0.5Bi0.5TiO3, BaBiO3, Bi4Ti3O12 and Bi2O3) were fabricated by a conventional solid state reaction. The effects of Bi-based compounds additives on the phase composition, microstructure and PTCR characteristics of BT ceramics were investigated with X-ray diffraction, scanning electron microscope, and resistivity-temperature measurement instrument. The results showed that the average grain size, the Curie temperature (Tc) and the room temperature resistivity (ρRT) of BT ceramics varied with the additives of Bi-based compounds. The minimum value of ρRT for BT ceramics with different Bi-based compounds could be obtained when the atom concentrations of bismuth were around 0.2%. The ceramic samples showed a moderate PTCR effect, with a resistance jump greater by 1.4–3 orders of magnitude and increased Tc about 120–132°C, along with a low resistance of 4–1500Ωcm.
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