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         The large single decagonal quasicrystals of 0.8 mm in diameter and 10 mm in length in Al-Cu-Co-Ge alloy have been obtained by controlled unidirectional solidification.In the process of growth, all of the single quasicrystals grew preferentially along uni-orientation of solidification.The centre axis of quasicrystalline prisms is the tenfold rotational symmetry axis. Under the condition of temperature gradient about 95¡æ/ cm,the segregation will be occurred and the growing interface will be changed from...  
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         The measurements of thermopower in AlNiCo decagonal single quasicrystals provide a clear and direct demonstration of a strongly anisotropic electron phonon mass enhancement with the effect in the quasicrystalline plane an order higher than that along the periodic direction.  
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