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- Title
Preparation and positive temperature coefficient of resistivity behavior of BaTiO-BaBiO-BiNaTiO ceramics.
- Authors
Zhang, Chi; Lu, Lixia; Yang, De'an
- Abstract
In this study, as a promising material for lead-free positive temperature coefficient of resistivity ceramics, (1 − x − y)BaTiO − xBaBiO − y(BiNa)TiO (x = 0.001, 0.002, 0.003; y = 0, 0.002, 0.004, 0.006, 0.01) samples were prepared by the conventional mixed oxide method. All the samples were sintered in air atmosphere for 1 h. X-ray diffraction, scanning electron microscope and resistivity-temperature measurement were used to study the crystal structure, microstructure and resistivity-temperature dependence. The results revealed that proper amount of BaBiO doping not only decreased the room temperature resistivity, but also increased the Curie temperature. Its optimal doping content was finally chosen as 0.2 mol%. And with an increase of BNT content, both the Curie temperature and the room temperature resistivity increased. When BaBiO = 0.2 mol%, BNT = 0.6 mol%, the Curie temperature was 153 °C and the room temperature resistivity was 1512 Ω cm. When the BNT content increased to 1 mol%, the Curie temperature increased to 157 °C but the room temperature resistivity increased sharply to 4.0 × 10 Ω cm.
- Subjects
BARIUM titanate; TEMPERATURE coefficient of electric resistance; BISMUTH compounds; CERAMIC materials; LEAD-free ceramics; X-ray diffraction
- Publication
Journal of Materials Science: Materials in Electronics, 2015, Vol 26, Issue 10, p8193
- ISSN
0957-4522
- Publication type
Article
- DOI
10.1007/s10854-015-3480-7