PZT-NiTi铁电-铁弹多层膜的制备及表征

PREPARATION AND CHARACTERIZATION OF THE FERROELECTRIC-FERROELASTIC PZT-NiTi MULTILAYER FILMS

  • 摘要: 用溶胶-凝胶法制备了PZT压电薄膜,研制了Au/PZT/PT/TiO2/NiTi/Si(100)多层膜结构,用XRD、AFM、TEM-EDX和SAD技术考察了薄膜的表面形貌、相结构演化、以及剖面的元素分布特性。结果表明:PZT膜与NiTi合金膜的结合良好、稳定;PT层的引入,使无定型PZT薄膜在550℃退火后,转变为钙钛矿结构,降低了晶化温度,并有效地抑制焦碌石相的形成;NiTi薄膜结晶良好;TiO2过渡层显著改善了PZT膜与NiTi合金膜的结合性能;多层结构界面Ni元素的扩散明显。介电、铁电性能测试结果表明PZT薄膜仍保持了较高的介电常数、低损耗、低漏电流密度,PZT-NiTi结构呈现电滞回线。PZT与NiTi的复合在工艺和性能上是可以兼容的。

     

    Abstract: The Pb(Zr,Ti)O3(PZT) thin film was fabricated by sol-gel technique to form Au/PZT/PT/TiO2/NiTi/Si(100) structure. The surface morphology phase structure evolution, and the element profiles were examined by using AFM, XRD, TEM-EDX and SAD methods. Results of experiments showed that PZT thin film was well connected with NiTi film; the crystallization temperature of the PZT was reduced by introducing PT layer; both PZT and NiTi were well crystallized; the amorphous PZT thin film transited to the perovskite phase after annealing at 550℃ for 30 min, the formation of pyrochlore phase was effectively retarded; the lattice matching was improved by TiO2 layer; the interdiffusion of mickel in the multilayer was revealed. The measurement results indicated that the PZT thin film in the Au/PZT/PT/TiO2/NiTi/Si(100) multilayer retained high dielectric constant, low dissipation factor, low leak current density and ferroelectric hystersis loop, showing its compatibility with NiTi film in processing and properties.

     

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