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Quasicrystalline films and their amorphous precursors

机译：拟晶膜及其无定形前体

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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-phase. 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 are 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：通过在Al-Mn，Al-Fe，Al-Cu-Fe和Al-Pd-Mn的情况下，通过序列闪蒸的蒸发技术制备二元和三元铝基非晶前体膜，并通过共溅射Al-PD-Re。对于良好的调节组合物和适当的热处理膜可以转化为上述所有系统的多晶单相拟序列。可以通过原位测量电子传输特性来监测转换。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素。如果组合物被选择为相关的拟拟形术的组合物，它们展示了独特的行为。对于无定形相的高退火状态，结构因子在以下I相的峰位置变得更加强烈。这被解释为I相及其无定形前兆的独特径向和中范围顺序。对于Al-Pd-Mn和Al-Pd-Re的情况，对丙烯酸酯的最终转化是夏普的。所得单分相膜的运输性质与相关散装样品的运输性质类似，并允许系统研究作为组合物的函数。一些I-Al-PD-RE膜位于金属绝缘体过渡的绝缘侧。

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