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首页> 外文会议>Symposium on Quasicrystals-Preparation, Properties and Applications Nov 27-30, 2000, Boston, Massachusetts, U.S.A. >Quasicrystalline Films and their Amorphous Precursors
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Quasicrystalline Films and their Amorphous Precursors

机译：准晶膜及其非晶前体

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摘要

Binary and ternary aluminum based amorphous precursor films have been prepared by the sequential-flash evaporation technique in the case of Al-Mn, Al-Fe, Al-Cu-Fe and Al-Pd-Mn and by co-sputtering in the case of Al-Pd-Re. For well adjusted compositions and an appropriate heat treatment films can be transformed into polycrystalline single phased quasicrystals for all of the systems mentioned above. The transition can be monitored by in situ measurements of electronic transport properties. The structure factors as a function of composition and annealing state has been measured by electron diffraction. They show a unique behavior if the composition is chosen to that of the related quasicrystal. For high annealing states of the amorphous phase the structure factor becomes more intense at the peak positions of the following i-phasc. This is interpreted as a unique radial near- and medium-range order of both the i-phase and its amorphous precursor. The final transformation into the quasicrystal is sharp for Al-Cu-Fe and is broad in the case of Al-Pd-Mn and Al-Pd-Re. The transport properties of the resulting single phased films arc similar to that of the related bulk samples and allow systematic studies as a function of composition. Some of the i-Al-Pd-Re films are on the insulating side of the metal-insulator transition.
机译：在Al-Mn，Al-Fe，Al-Cu-Fe和Al-Pd-Mn的情况下，通过顺序闪蒸技术制备了二元和三元铝基非晶态前体膜，在Al-Mn，Al-Pd-Mn情况下，通过共溅射制备Al-Pd-Re。对于上面提到的所有系统来说，对于组成调整良好和适当的热处理，可以将薄膜转变成多晶单相准晶体。可以通过电子传输特性的原位测量来监视过渡。已经通过电子衍射测量了作为组成和退火状态的函数的结构因子。如果选择的成分与相关准晶体的成分相同，则它们显示出独特的行为。对于非晶态相的高退火态，结构因子在随后的i相的峰值位置处变得更强烈。这被解释为i相及其无定形前体的独特的径向近距离和中等距离次序。对于Al-Cu-Fe，最终转变为准晶体是很明显的，而对于Al-Pd-Mn和Al-Pd-Re来说，则是宽泛的。所得单相膜的传输性质与相关的大块样品的传输性质相似，并且允许根据组成进行系统的研究。一些i-Al-Pd-Re膜位于金属-绝缘体过渡层的绝缘侧。

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