Bi、Nb双施主掺杂对钛酸钡基陶瓷性能的影响

本文首次在钛酸钡中以BiCl3、NbCl5的溶液形式引入Bi、Nb元素,采用低温固态反应制备了Bi、Nb双施主掺杂的纳米BaTiO3基PTC陶瓷粉,同时研究了烧结条件对PTC陶瓷材料性能的影响。利用XRD和TEM分析了样品的物相及微观形貌,发现样品为立方晶系的完全互溶取代固溶体,颗粒基本呈球形,且分布比较均匀,粒径大约50～60 nm。制陶实验表明,以Bi、Nb进行双施主掺杂可有效改善材料的PTC性能,当最佳烧结温度为1 330℃、保温时间为20 min时,可以得到室温电阻为12.93Ω,升阻比为1.920×105的电性能优良的PTC陶瓷。

Influence of Bi and Nb Codoping on the Behaviors of BaTiO3-Based PTC Ceramics

A series of doped BaTiO3-based PTC ceramic powders used BiCl3 and NbCl5 as donor dopant were prepared by solid-state reaction at low temperature.The influence of sintering process on the PTC effect was studied.The XRD and TEM were used to study the phases and micrographs.The results show that the compounds are mutually miscible in the solid solutions and have a shape of uniform,substantially spherical particles with an average partical size of 50～60 nm in diameter.As indicated by preparing ceramics,the PTC effect is improved by doping double donor Bi and Nb.It was found that the R25 is 12.93 Ω and ratio of Rmax / Rmin is 1.920×105 respectively when the ceramics materials sintered at 1 330 ℃ for 20 min.