Abstract
As a lead‐free positive temperature coefficient of resistivity (PTCR) material, (1–x mol%) BaTiO3–x mol% (Bi1/2K1/2) TiO3–y mol% Y2O3–0.5 mol% TiO2 (BT–xBKT–2yY–0.5TiO2) systems were prepared by the conventional solid‐state reaction method. All samples containing <2 mol% BKT sintered in air possessed relatively low room‐temperature resistivity (ρ25) and high positive temperature coefficient (PTC) effect. However, when the BKT content exceeded 2 mol%, the sample was not semiconductive after sintering in air. The effects of sintering schedule on the properties of PTCR ceramics were discussed. The results showed that the optimum composition of BT–1BKT–0.2Y–0.5TiO2, sintered at 1330°C for not‐soaking and then fast quenched in air, achieved rather low ρ25 of 28 Ω·cm and a high jump of resistivity (maximum resistivity [ρmax]/minimum resistivity [ρmin]) of 4.0 orders of magnitude with Tc about 155°C. The ρ25 of the as‐sintered sample could be further reduced to about 10 Ω·cm by annealing in N2 at 450°C for 30 min, accompanied decrease on the PTC effect.
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