Abstract
Lead-free PTCR ceramics based on Bi2O3 and Y2O3 doped Ba0.95Ca0.05TiO3 were fabricated by the conventional mixed oxide method, while Bi2O3 and Y2O3 were doped directly or after pre-calcining, in the molar ratio of Bi2O3:Y2O3 = 1:1. There were two synthesizing route, i.e. the materials were pre-calcined at 900 °C to obtain BiYO3 firstly and then doped into the basic materials, and the materials were directly doped into the starting materials, both of which could obtain samples with different electrical properties and PTCR behavior. The samples were characterized by using X-ray diffraction, scanning electron microscope, dielectric constant-temperature and resistivity-temperature measurement instrument. It was revealed that the perovskite lattice, the microstructure and the PTCR behavior of Ba0.95Ca0.05TiO3 varied with different doping contents and methods. A further research was conducted so as to study the electrical properties of ceramics by impedance spectroscopy.
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