Abstract
Two types of positive temperature coefficient of resistance (PTCR) ceramics with relatively low room-temperature resistivity were prepared using the four-component system (Ba, Sr, Ca, Pb)TiO3 with lanthanum oxide (La2O3) as the donor dopant and boron nitride (BN) as the sintering aid. The first type of materials was sintered at 1080 °C for 2 h. It has a Curie point \(T_c \sim 120 ^\circ C\), a room-temperature resistivity \(\rho _v\) of 58 Ω cm and a resistivity jump Δρ of \(3 \times 10^4 \Omega cm\) around \(T_c\). For the second type of materials that were sintered at 1100 °C for 20 min, \(T_c \sim 120 ^\circ C\), \(\rho _v = 19\Omega cm\) and \(\Delta \rho = 10^4 \Omega cm\). These PTCR ceramics are considered to be suitable materials for fabricating multilayer PTCR devices by the co-firing process. Factors associated with the composition that influence the PTCR property of the materials are discussed.
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