预极化对PST薄膜介电可调性的影响  

The Effect of Pre-Polarization on Dielectric Tunability of PST Thin Film

作　　者：郑赞[1] 杜丕一[1] 赵冉[1] 翁文剑[1] 韩高荣[1] 

机构地区：[1]硅材料国家重点实验室,浙江大学材料科学与工程系,浙江杭州310027

出　　处：《稀有金属材料与工程》2008年第A02期188-191,共4页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(50372057);国家自然科学基金重点项目(50332030)

摘　　要：采用溶胶凝胶工艺,在ITO透明导电玻璃基板上成功地制备了Zn掺杂的Pb0.4Sr0.6TiO3(PST)铁电薄膜。利用XRD测定了薄膜的相结构,精密阻抗分析仪研究了薄膜的介电性能。在不同外加直流电场下测试Zn掺杂PST薄膜的介电性能,研究薄膜的介电可调性大小与外加偏压施加顺序的关系。结果表明,该薄膜呈现单一的钙钛矿相结构。发现了在预先施加一个相对较高的预极化电场,薄膜在零电场下的介电常数得到了提高。预极化能更多地激发出介电薄膜中偶极子数目,增大了薄膜在零偏压处的介电常数,从而提高了薄膜的介电可调性,在不同的测试电压下可分别从提高3%到提高45%不等,测试电压越低,表现出来的这种提高就越大。Zn-doped PST thin films （Pb0.4Sr0.6）ZnxTi1-xO3-x（x=0-0.12） were fabricated by sol-gel dip-coating method on ITO/glass substrate. The phase structure and dielectric property of the thin film were measured by X-ray diffractometer and accurate impedance analyzer respectively. Results showed that all the thin films had the perovskite phase structure. After pre-polarization, it was found that the dielectric constant of the Zn-doped PST thin films increased at zero DC bias, so did the dielectric tunability. Due to the increase of polaron through pre-polarization, the dielectric tunability of the thin film can be enhanced by 3% to 45% depending on bias. The lower the DC bias is, the better the tunability is.

关 键 词：Zn掺杂PST薄膜 预极化 介电可调 

分 类 号：O484.42[理学—固体物理]