Doping effect of Ta5+ ions on microstructure and electrical properties of BaTiO3-(Bi0.5Na0.5)TiO3 ceramics with positive temperature coefficient of resistivity

作者：Yang, Mengmeng; Wang, Chengbiao; Peng, Zhijian^*; Fu, Xiuli^*

来源：Journal of Materials Science: Materials in Electronics , 2017, 28(14): 10589-10595.

DOI：10.1007/s10854-017-6833-6

• FREE PTCR CERAMICS
• BATIO3 CERAMICS
• BEHAVIOR
• REOXIDATION
• NB2O5

Lead-free 0.912Ba(0.97)TiO(3)-0.088(Bi0.5Na0.5)TiO3-xTa(2)O(5) (0 <= x <= 0.005) ceramics with positive temperature coefficient of resistivity (PTCR) were prepared by solid reaction sintering of high-purity metal oxides and carbonates reagents. The doping effect of Ta5+ ions on the microstructure and electrical properties of the samples was investigated. X-ray diffraction analysis indicated that all the samples were of a single tetragonal perovskite structure with the calculated c/a value first increased and then decreased with increasing x. The Raman shift at 305 cm(-1) became strong firstly and then declined, and the broad band at 722 cm(-1) narrowed initially and then broadened with the increase in Ta5+ content. The Curie temperature raised first and then decreased, presenting the highest value up to 170 A degrees C for the samples with x = 0.001. Moreover, after the incorporation of Ta5+ ions, the PTCR (defined by the resistivity jump with the ratio of maximum to minimum ones) decreased first and then increased, presenting the best PTCR performance for the samples with x = 0.005. And with increasing x, the room temperature resistivity decreased first and then increased, displaying the lowest room temperature resistivity for the samples with x = 0.003.

• 出版日期2017-7
• 单位北京邮电大学; 中国地质大学（北京）