(Ba, Sr)TiO3-Mg2TiO4系统的调谐率研究
首发时间:2014-10-28
摘要:采用固相反应法制备了(Ba, Sr)TiO3-Mg2TiO4复合陶瓷样品。通过X射线衍射仪,场发射电子显微镜和Raman光谱仪分析了样本的微观结构和物相组成,并且测量和分析了样本的介电常数与调谐率。随着样本中Mg2TiO4成分的增多,复合陶瓷材料样本的调谐率首先急剧下降,然后开始缓慢的上升,最后又开始降低。这个过程可以分为三个不同的区间:"初始下降区","反常上升区"和"最终下降区"。"反常上升区"对于其在微波器件上的应用十分有利。对于(1-x)Ba0.45Sr0.55TiO3-xMg2TiO4复合陶瓷来说,当Mg2TiO4的含量从7.5wt%增加到50wt%时,样品在2kV/mm电场下的调谐率从4.3%增加到了9.7%。在同样的条件下,(1-x) Ba0.5Sr0.5TiO3-xMg2TiO4陶瓷样品的调谐率也从8%增加到了14.2%。这种反常的调谐率上升的现象是由复合效应引起的电场再分配所导致的,同时居里温度的变化也对这个区间的调谐率产生了较大的影响。
For information in English, please click here
The tunability in (Ba, Sr)TiO3-Mg2TiO4 system
Abstract:(Ba, Sr)TiO3-Mg2TiO4 composite ceramics were fabricated via solid-state reaction method. The XRD, FESEM and Raman spectroscopy techniques were used to characterize the microstructures and phase compositions. The dielectric characteristics and tunability of composite ceramics were investigated. With the increase of Mg2TiO4 content, the tunability of (Ba, Sr)TiO3-Mg2TiO4 decreases first, then increases and finally decreases. The composition of (Ba, Sr)TiO3-Mg2TiO4 can be divided into three regions: "initial decreasing region", "unusual increasing region" and "final decreasing region". This "unusual increasing region" is beneficial for tunable microwave applications. For (1-x)Ba0.45Sr0.55TiO3-xMg2TiO4, the tunability at 2kV/mm increases from 4.3% to 9.7 % with Mg2TiO4 content increases from 7.5 to 50 wt%. For (1-x) Ba0.5Sr0.5TiO3-xMg2TiO4, the corresponding tunability increases from 8% to 14.2%. The three regions are also observed in (Ba, Sr)TiO3-MgO system. The unusual increased tunability is due to electric field redistribution caused by composite effect and the change of Curie temperature also has a great impact on the tunability in this region.
Keywords: Tunability ferroelectrics dielectrics composite
论文图表:
引用
No.4614431100654314****
同行评议
共计0人参与
勘误表
(Ba, Sr)TiO3-Mg2TiO4系统的调谐率研究
评论
全部评论0/1000