BiNbO<sub>4</sub>掺杂对BaTiO<sub>3</sub>陶瓷居里点的影响及微观性能研究

BiNbO₄掺杂对BaTiO₃陶瓷居里点的影响及微观性能研究

摘要: 本文研究了BiNbO₄掺杂对钛酸钡陶瓷居里点移动及微观性能的影响。实验结果表明, 随着BiNbO₄掺杂量的增加, 钛酸钡陶瓷的四方率单调下降, 而居里点先降低后升高, 居里点的变化与陶瓷的微观应力变化一致。BiNbO₄掺杂在0%~2%范围内时, 能有效抑制BaTiO₃陶瓷晶粒的生长, 有助于陶瓷烧结的致密化, 但过分掺杂会使陶瓷晶粒间气孔率增加, 并产生第二相。

Abstract: The influences of BiNbO₄ on the shift of Curie point as well as structural and micro-structural properties of BaTiO₃-based ceramics have been investigated.The experiment results showed that the tetragonality declined gradually with increasing BiNbO₄, while the Curie point initially reduced, minimized at 123℃, and then increased.The variation of Curie point agreed with the change of microstrain value.When the content of BiNbO₄ is in the range of 0~2 wt%, the grain growth was retarded, which was propitious to the densification of samples.However, excessive addition of BiNbO₄ would produce a secondary phase and increase the porosity.