Effect of the Nb2O5 content on electrical properties of lead-free BaTiO3–Bi0.5Na0.5TiO3 ceramics
| Autor: | De’an Yang, Hailong Li, Feng Guo, Yuanfang Qu, Jianning Kang |
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| Rok vydání: | 2013 |
| Předmět: |
Volatilisation
Materials science Orders of magnitude (temperature) Process Chemistry and Technology Doping Analytical chemistry Mineralogy Sintering Acceptor Surfaces Coatings and Films Electronic Optical and Magnetic Materials Electrical resistivity and conductivity visual_art Materials Chemistry Ceramics and Composites visual_art.visual_art_medium Curie temperature Ceramic |
| Zdroj: | Ceramics International. 39:7589-7593 |
| ISSN: | 0272-8842 |
| Popis: | (1−x)BaTiO3–xBi0.5Na0.5TiO3 (BT–BNT) ceramics were prepared by the solid-state reaction method. With an increase of BNT content, both the Curie temperature and the room temperature resistivity increased. At 1 mol% BNT addition, the sample was not semiconducting, due to Bi2O3 volatilization resulting from the decomposition of pre-calcined BNT during sintering. Appropriate extra Nb2O5 doping in the raw materials could offset Bi2O3 volatilization and neutralize the redundant acceptor Na+ ions. When the extra Nb2O5 content was 0.6 mg, the sample room-temperature resistivity was 6.3×103 Ω cm, with the Curie point about 135 °C and a high PTC effect of ∼3 orders of magnitude. |
| Databáze: | OpenAIRE |
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