By Sean D. Barrett, S. S. Dhesi
An advent to the suggestions of floor crystallography and surface-structure choice. The e-book outlines the rules of the main regular experimental suggestions and theoretical simulations, and stories their program to the surfaces of rare-earth metals. particularly, the result of quantitative low-energy electron-diffraction experiments and multiple-scattering calculations are lined in a few intensity. The publication is geared toward technological know-how graduates with an curiosity in floor crystallography.
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Extra resources for The Structure of Rare-Earth Metal Surfaces
For the ideal dhcp (0001) surface, t h e n u m b e r of possible stacking sequences in the top four surface layers is four and t h u s the complexity of the calculations involved in surface structure determinations are greater t h a n for hep. As can be seen from the stacking sequence t h a t defines the dhcp crystal structure (Fig. 2), it can be regarded as an equal mix of close-packed layers t h a t are hep-like and fcc-like (Fig. 9). The four #1 hep-like fcc-like hep-like T fcc-like f #2 #3 #4 -A— -B— —C"-B~ -A— ™B — — A«-C"~ -B-— —C— — A—C~» fcc-like hep-like fcc-like hep-like Fig.
1, three are of particular relevance to studies of the structure of rare-earth metal surfaces. Cutting the hep crystal structure parallel to its principal planes (as shown in Fig. 3) produces the surface structures shown in Fig. 4. The surface unit cells (indicated by the parallelograms drawn in bold) are hexagonal for the (0001) surface and rectangular for both the (1120) and (lOlO) surfaces. 1). As a consequence of this, the interlayer The Basics of Surface Structure 27 (1010) (0001) (1010) (1120) Qjj Surface Atoms Qj Subsurface Atoms (1010) Fig.
This provides a base for an Y(0001) seed layer that is then lattice-matched to the other rare-earth component(s) of the superlattice. For metals that adopt the fee or hep crystal structure in the bulk phase, two preferred orientation relationships exist for the growth of overlayers on bec (110) surfaces at monolayer and multilayer coverages. They are referred to as the Nishiyama-Wassermann (NW) and Kurdjumov-Sachs (KS) structures and are illustrated in Fig. 13. The NW orientation aligns the close—packed (110) rows of the fee overlayer (or, equivalently, the (1120) rows of the hep overlayer) to the (100) rows of the bee substrate.