Figure 3.8 The minimum Keating energies for the H_3-, T_4-, and B_5-model structures of the Si{111}rt3*rt3-30-X surface as a function of the adsorbate's covalent radius.
The tetrahedral covalent radii for C, B, Si, Ge, Al, Ga, Sn, In, and Pb are 0.77, 0.88, 1.18, 1.22, 1.26, 1.26, 1.40, 1.44, and 1.46 Ang., respectively.

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