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in a classical crystalline thin-film system ÔÚ¾µäµÄ¾§Ì壨½á¾§£©±¡Ä¤ÏµÍ³ classical ·Òë³É¾µäµÄ£¬¾ßÌå¼ûÏÂÎÄ£º Quasicrystalline structure formation in a classical crystalline thin-film system Here we report an aperiodic oxide that grows as a two-dimensional quasicrystal on a periodic single-element substrate. On a Pt(111) substrate with 3-fold symmetry, the perovskite barium titanate BaTiO3 forms a high-temperature interface-driven structure with 12-fold symmetry. The building blocks of this dodecagonal structure assemble with the theoretically predicted Stampfli¨CGähler tiling10, 11 having a fundamental length-scale of 0.69 nm. This example of interface-driven formation of ultrathin quasicrystals from a typical periodic perovskite oxide potentially extends the quasicrystal concept to a broader range of materials |

3Â¥2014-01-10 22:09:04
lukecana
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4Â¥2014-01-11 08:54:39
spiegboy
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5Â¥2014-01-11 20:34:14
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6Â¥2014-01-12 01:56:38














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