The invention belongs to the field of preparing a non lead ferroelectric film with a component gradient distribution by chemical method and a preparation method thereof. The invention has the composition gradient distribution of Ba (Ti, Zr or Sn) O: 3 ferroelectric thin films containing Ba (Ti: 1 x, Zr or Sn: x): O 3, X 0 - 0.70. Gradient film of the invention relates to Ba (Zr, Ti): O 3 (BZT) and Ba (Ti, Sn): O 3 (BTS) is a non lead system, in the preparation process, especially in the integration process and the Si process does not lead pollution, and adjust the temperature range the relatively wide. With the barium strontium titanate (BST) than in the structure: Ba (Zr, Ti): O 3 (BZT) and Ba (Ti, Sn): O 3 (BTS) B alternative materials belonging to the ABO down 3 in the perovskite structure, the grain size can be adjusted in the range of relatively large; performance: for thin film material to reduce the leakage, improve the compressive properties, broaden the scope of application of gradient film. With the uniform distribution along the thickness of the component BZT and BTS ferroelectric thin films, the invention has the composition gradient distribution of Ba (Ti, Zr or Sn): 3. The temperature characteristics of O ferroelectric thin films have higher dielectric constant and improvement.
【技术实现步骤摘要】
本专利技术属于一种采用化学方法制备具有成份梯度分布的非铅系铁电薄膜及其制备方法领域。
技术介绍
一般情况下,在铁电材料的相变点附近,其介电常数随温度的变化而产生较大的改变,在其居里点附近尤其明显。对于铁电材料而言,往往在其相变点附近,具有较高的介电常数、热释电系数以及压电性能等。但由于在相变点附近其温度特性不好,限制了它的适用范围。对于铁电薄膜材料而言,为了改变它的温度特性,所制备的(Ba,Sr)TiO3(BST)铁电薄膜沿厚度形成成份梯度,在一定程度上改善了薄膜的温度特性。但由于BST薄膜有较高的漏导损耗,因而其应用受到一定的局限,这就需要一种高介电常数,低漏导损耗的薄膜材料。作为BST的替代材料有Ta2O5、(Ba1-xSrx)(Ti1-yZry)O3(BSTZ)、Ba(Zr,Ti)O3(BZT)以及Ba(Ti,Sn)O3(BTS)等。锆钛酸钡Ba(ZrTi)O3(BZT)和Ba(Ti,Sn)O3(BTS)是对BaTiO3(ABO3)钙钛矿结构进行B位替代而来。BZT和BTS薄膜具有较低的漏导电流,BZT和BTS薄膜在高频下同样具有良好的介电性能,因此可以 ...
【技术保护点】
一种具有成份梯度分布的Ba(Ti,Zr或Sn)O↓[3]铁电薄膜,含有Ba(Ti↓[1-x],Zr或Sn↓[x])O↓[3],其中X为0~0.70。
【技术特征摘要】
还没有人留言评论。发表了对其他浏览者有用的留言会获得科技券。