电泳沉积法制备纳米磁电多铁性复合薄膜的研究

项目名称： 电泳沉积法制备纳米磁电多铁性复合薄膜的研究

项目编号： No.60871017

项目类型： 面上项目

立项/批准年度： 2009

项目学科： 金属学与金属工艺

项目作者： 周东祥

作者单位： 华中科技大学

项目金额： 34万元

中文摘要： 分别制备出稳定的BaTiO3（BTO） 和CoFe2O4(CFO)悬浮液，采用的BTO和CFO粉体分别由溶胶凝胶法和化学共沉淀法制备，粒径约为100nm和40nm。同时还制备了稳定的Pb（Zb0.52Ti0.48）O3(PZT)悬浮液。系统研究了悬浮液的稳定机制，稳定性表征手段，沉积机制以及CFO粉体的尺寸效应对悬浮液稳定性的影响。基于稳定悬浮液，采用电泳沉积法在ITO导电玻璃衬底上分别制备了单层BTO和CFO膜，以及层状结构的PZT-CFO多铁复合膜。系统研究了制备的单层膜和层状复合膜的微观结构、铁电性和铁磁性，结果表明：单层膜和复合膜均具有良好的致密性，复合膜具有明显的层状结构以及良好的铁电性和铁磁性。 用溶胶凝胶法制备了不同摩尔比例的BTO/CFO复合粉体，以乙酰丙酮和乙醇（体积比1:1）为溶剂配制了稳定的悬浮液，采用电泳沉积法制备了0-3型多铁复合膜。当BaTiO3 和CoFe2O4摩尔比为3:2和1:1时，复合膜具有较小的漏电流，并表现出良好的铁电性和铁磁性。研究设计了极间距离可调的电泳沉积设备以及测量多铁复合膜逆磁电耦合效应的测试系统。

中文关键词： 电泳沉积；多铁复合膜；悬浮液；铁电性；铁磁性

英文摘要： The stable BaTiO3(BTO) and CoFe2O4(CFO) suspensions were prepared, respectively. The used BaTiO3 powder with particle size of 100 nm and CoFe2O4 powder with particle size of 40 nm were synthesized using sol-gel and co-sedimentation methods, respectively. The stable Pb(Zr0.52Ti0.48)O3 (PZT)suspension was also prepared. For the suspension, the stability mechanism; methods of reflecting the stability and deposition mechanism were investigated systemically. Also, the influence of the size effect of CFO powder on the stability of suspension was studied. On the basis of study of suspensions, BTO and CFO single layer films were fabricated on ITO substrates via electrophoretic deposition (EPD), and layered PZT-CFO multiferroic composite films were also gotten by using EPD. Ferroelectric and ferromagnetic properties and microstructures of the fabricated single and composite films were studied. The results show that the single and composite films are dense, and composite films have clear layered structures and good ferroelectric and ferromagnetic properties. Sol-gel method was used to prepare BTO/CFO composite powder with different molar ratio. The solvent acetylacetone-acetic acid (1:1 volume fraction) was chosen to prepare stable suspension, and the 0-3 type multiferroic composite films were obtained by using EPD. When the molar ratio is 3:2 and 1:1 between BTO and CFO, the composite films possessed lower leakage, and good ferroelectric and ferromagnetic properties. In addition, the device for EDP with tunable electrode distance and the testing system for measuring converse magnetoelectric effect of multiferroic composite films were designed.

英文关键词： electrophoretic deposition; multiferroic composite films; suspension; ferroelectric property; ferromagnetic property