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- W2009451684 abstract "The influence of imperfections of single crystal surfaces on two-dimensional phase transitions is studied by LEED and AES. On a smooth, well-ordered (100)Cu or NaCl face, the first adsorbed layer of xenon undergoes a 2D gas-incommensurable solid first order transition. This transition broadens and becomes continuous on the disordered (100)Cu, the stepped (610)Cu and the disordered (610)NaCl surfaces. The corresponding small variation (±3%) of the chemical potential along the surface can be explained by a defect induced variation of adsorption energy on the substrate for the Cu surfaces or by a limitation of the size of 2D crystals by surface imperfections for the (610)NaCl substrate. Heterogeneities do not modify the lateral structure of 2D solid xenon which remains hexagonal close-packed, but they reduce the size of 2D crystallites in the case of the disordered (610)NaCl substrate. Other spectacular effects are observed on the (610)Cu surface having periodic monoatomic steps: (i) There is a 45° rotation of the 2D crystal with respect to its position on the smooth (100)Cu surface. Hence, the orientational ordering of the xenon overlayer changes drastically, (ii) The LEED pattern at T = 84 K is interpreted as due to a pseudo hexagonal close-packed xenon overlayer with a (2 × 6) coincidence mesh, orientated along the step direction. Moreover, the step edge roughness and the xenon atom size induce a static transverse distortion wave whose wavelength varies with temperature." @default.
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- W2009451684 date "1980-07-01" @default.
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- W2009451684 title "Phase transitions on stepped and disordered surfaces: Xe adsorbed on Cu and NaCl single crystal surfaces" @default.
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- W2009451684 doi "https://doi.org/10.1016/0039-6028(80)90110-7" @default.
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