2010•Materials and Manufacturing ProcessesRequires access
Characteristics of the PTCR in High-Curie-Point Lead-Free Barium Titanate Ceramics and Their Grain Structures
Jinfei Wang, Yongping Pu, Gongan Yang, Xiaolong Chen
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Abstract
The influences of Bi4Ti3O12 (BIT) content on the electrical property and the microstructure of Ba0.998La0.002TiO3-based materials have been studied. At a low dopant concentration the grain size is influenced significantly by the donor concentration. With an increase in BIT content the grain size decreases rapidly. All the prepared BIT doping Ba0.998La0.002TiO3-based thermistors show a typical positive temperature coefficient (PTC) effect. As the amount of BIT added in Ba0.998La0.002TiO3-based ceramics increases, the room temperature resistivity appears to exhibit a minimum value. At high BIT content (≥2.0), the room temperature resistivity increased again with increasing BIT content. At a given content of BIT, the influence of sintering temperature on the electrical properties of samples has been investigated.