Physics – General Physics
Scientific paper
2012-01-25
Physics
General Physics
3 pages (3 figs, 11 refs) RevTeX, cf. http://www.umsl.edu/~fraundorfp/help/imagnxtl.htm
Scientific paper
The new International System of Units may let us select an integer value for Avogadro's number. Some might prefer an integer that's divisible by 12, so that an integer number of $^{12}C$ atoms may be associated (at least to first order) with a gram's mass. For educational as well as practical reasons it may also help to choose a {\em physically-meaningful} definition, within measurement error of the current numeric value. Cubes of diamond face-centered-cubic Si and (much rarer) face-centered-cubic C have been proposed, but these structures don't have naturally occurring facets (or numbers of atoms generally divisible by 12). We show here that graphite prisms formed by stacking $m$ hexagonal graphene sheets, with $m$ Carbon-12 atoms on each side, are a natural solution to this challenge.
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