Immiscible Al-pb Department Of Nano-interface Of Thin Film Materials, Structure And Optical Properties Study

There are more than 500 kinds of immiscible alloy systems and most of the alloy structures may exhibit special physical and mechanical properties. These materials may have abroad application such as engineering and electronic materials. Membrane Technology has provided a wider space and more powerful method to the research and application of immiscible alloy system. The sputtering deposition is a more useful depositing method for any soild-state matter. Al-Pb alloy, has wide miscibility gap in liquid, a very limited degree of solubility in solid-state and complementary physical and chemical properties, is the typical system in the research. It has great importance to research the microstructure and performance of the Al-Pb film materials.Immiscible system of Al/Pb metal nano-multilayers with different modulated wavelengths and periodicities were obtained through magnetron sputtering depositing. The morphology of the film and crystal particle, dimension and existence was observed by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The surface roughness was analysed by atom force microscopy (AFM). The configuration characteristics were obtained by the x-ray diffraction. The chemical composition was tested by X-ray photoelectron spectroscopy (XPS). The content of each composition was tested by EDS. The reflection and transmission of multilayer was measured by through spectrophotometer and Fourier Infrared Spectrometer. The conclusion of the paper includes:In magnetron sputtering nanometer Pb film change into Pb particles, and then the Pb particles, spheroidized from Pb film, coalesce with each other after spheroidization of Pb film. Coalescing with each other is the only way of growing up for Pb particles. As a result of Pb film "thickness of ups and downs", the spheroidization of Pb film takes place. By calculating the system energy before and after the spheroidization of Pb film, the Pb/Al Interfacial energy value is 896.3 mJ/m2. It is larger than, the Interfacial energy value difference of Al and Pb, 568mJ/m2 and less than, the sum of the Interfacial energy value of Al and Pb, 1722mJ/m2. Spheroidization of Pb film was just driven by large Pb/Al interfacial energy. The Pb particles, spheroidized from Pb film, have good mobility on supporting Al film, and reduce the system free energy by Pb particles'coalescing with each other. The neck area between the two Pb particles with the increase in particle size coarsens, and the curvature radius of the neck area increases. The coalescing chemical driving force of Pb particles with increase in the curvature radius of the neck area reduced, then the mobility and the coalescing rate of Pb particles reduced.The results of AFM and XPS indicated that the surface roughness of the Al film was higher than that of the Pb film. It was difficult for Al film to cover Pb film. Reversely, it was easy for Pb film-to cover Al film. The results of SEM showed that Pb film exhibits island performance and the Pb particles dispersing on the Al film when the modulated wavelength was small. The growth model of Pb film was Layer-by-layer growth and island growth. The layers and the particles all possess nano-dimension. There was no boundary between layers but a transition layer of Al/Pb mixture.The results of TEM indicated that the increase of the modulated wavelength of single layer was propitious to achieve the prospective complete layer. So the necessary condition of layer-by-layer growth was appropriate modulated wavelength.The results of XRD showed that there was a preference tropism of Pb (111) in AL-Pb film. There was no diffraction peak of Al atom. It indicated that the volume ratio and particle dimension of Al particles was small in this film and Al atoms existed in the form of amorphous.The transmission and reflection of Metal nano-multilayer in Ultraviolet, visible, infrared spectrum has dimensional effect. The transmission and reflection of film has direct relationship with its structure. Generally, as the thickness increasing, the transmission experience the course slowly decreasing-rapidly increasing-gradually decreasing-steady-going, reversely, the reflection experience the course slowly increasing-rapidly increasing-gradually increasing-steady-going. And it is corresponding to the four growth steps of the metal layer:island-island and reticulation transition-reticulation and continuum transition-continuum.