BaTiO3基半导体PTCR陶瓷的研究进展

BaTiO3 is a typical positive temperature coefficient (PTC) of resistivity ceramic, mainly focusing on its electrical performances of room-temperature resistance, resistance jump ratio and Curie temperature. In this paper, the history, current situation and the latest process on BaTiO3-based PTC are discussed. It is found that the semiconducting BaTiO3 ceramics are normally associated with donor dopant and the increase in resistance of several orders of magnitude is associated with the phase transformation and the development of resistive barriers at the grain boundaries. Meanwhile, incorporation of the ferroelectric phase into the semiconducting BaTiO3-based ceramics is considered an effective way to increase the Curie temperature to a higher temperature. In addition, the new development trends of PTC with new physical mechanisms and applications are also discussed.