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The interplanar surface relaxations of seven face-centered and nine body-centered cubic metals are calculated for their three low index surfaces. In f.c.c. lattices the relaxation for the three surfaces is in the order (110) > (100) > (111) whereas in b.c.c. lattices the order is (111) > (100) > (110). In general the relaxation is greater for b.c.c. metals than for f.c.c. Comparing different metals of the same structure, it is found that the relaxation is closely related to a non-dimensional parameter Formula: see text, where α and r0 are parameters of the Morse potential.
D.P. Jackson (1971) studied this question.