Beam Induced Surface Alloying: Metastable Phases

这一合作研究项目由康奈尔大学j.w. Mayer；S. S. Lau，加州大学圣地亚哥分校；和J. M. Poate，位于默里山的at & & T Bell实验室将研究离子诱导晶体亚稳相的形成。这项研究将强调三个主要领域：1)铝-过渡金属体系，重点是离子诱导准晶，二十面体结构的形成；2)在接近深共晶的二元体系中，直接，热衬底，离子诱导转变为亚稳相；3)在硅或锗上的金属合金和在金属薄膜上的锗-硅合金的离子照射下，三元体系中亚稳相的形成。主要的分析方法将基于卢瑟福后向散射、x射线衍射、透射电子显微镜和现场电测量。在美国国家科学基金会（DMR-8106843）的支持下，这项研究是先前成功和富有成效的调查的延续。研究束致亚稳相是开发具有独特表面和电子性能的新型材料的一条很有前途的途径。这项研究的目的是为这些新材料的物理性质以及可能可用的新成分和性能范围提供重要信息。这一领域需要基本的理解，为材料科学家和工程师提供指导，他们现在正在寻求新的材料和加工技术。这项研究还将对材料科学和电子领域的合格研究人员的培养产生重大影响。

This collaborative program of research between J. W. Mayer, Cornell University; S. S. Lau, University of California (San Diego); and J. M. Poate, AT&T Bell Laboratories at Murray Hill will investigate ion- induced formation of crystalline, metastable phases. The study will emphasize three major areas: 1) aluminum-transition metal systems with emphasis on ion-induced formation of the quasicrystalline, icosahedral structure, 2) direct, hot substrate, ion-induced transformations to the metastable phase in binary systems near deep eutectics, and 3) formation of metastable phases in ternary systems using ion irradiation of metallic alloys on silicon or germanium and of germanium-silicon alloys on metal films. The primary analytical approach will be based on Rutherford backscattering, x-ray diffraction, transmission electron microscopy and in-situ electrical measurements. The research is a continuation of a previously successful and productive investigation under support from the NSF (DMR-8106843). Research on beam-induced metastable phases is a promising path to the development of new classes of materials with unique surface and electronic properties. The objective of the research is to provide important information on the physics of these new materials and on the range of new compositions and properties that may be available. Fundamental understanding is needed in this area to provide guidance for materials scientists and engineers who are now seeking new materials and processing techniques. The research will also have a significant impact on the production of qualified researchers in the field of materials science and electronics.