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M.O. King I.M. McLeod D. Hesp V.R. Dhanak M. Kadodwala D.A. MacLaren 《Surface science》2012,606(17-18):1353-1359
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Fe ions were implanted into α-Al2O3 single crystals (sapphire) at room temperature and annealed in a reducing atmosphere. The orientation relationships (ORs) between α-Fe particles and sapphire matrix were investigated using transmission electron microscopy (TEM). All the α-Fe particles have the orientation relationship (OR) of (1 1 1)α-Fe || (0 0 0 1)sapphire and with sapphire. This OR is predicted precisely by the coincidence of reciprocal lattice points (CRLP) method. The other OR of (1 1 0)α-Fe || (0 0 0 1)sapphire and reported before is confirmed by the same method to be one of the secondary preferred orientation relationships in the α-Fe/sapphire system. 相似文献
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M. Yokoyama W.S. Liang W. Chen A.T.S. Wee T. Matsui J. Yuhara 《Surface science》2011,605(7-8):844-847
The atomic arrangement of submonolayer Bi films on Rh(111) surface was examined using low-energy electron diffraction (LEED) and scanning tunneling microscopy (STM). With low coverage, the LEED patterns showed incommensurate (IC) spots. The unit cell of IC was close to c(2 × 4) and had twofold symmetry. As the coverage increased, the unit cell shrank continuously along the [] direction, and the commensurate c(2 × 4) was formed at a coverage of 0.5 ML. At the coverage above 0.5 ML, two different structures of c(2 × 4) and (4 × 4) were observed by STM. When the surface is fully saturated by monolayer Bi atoms, Bi atoms formed the uniform (4 × 4) structure with sixfold symmetry. This is due to a strong Bi–Rh attractive interaction resulting in the two-dimensional localization of Bi adsorbates on the surface. As a result, a symmetrical transition of Bi films from twofold to sixfold symmetry occurred on Rh(111). 相似文献
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