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short communications
Reassessment of atomic radii for CN12 and CN8 obtained from elemental f.c. and b.c. cubic structures
Differences of atomic radii RCN12 and RCN8 obtained from (i) elemental f.c. cubic (or c.p. hexagonal) and b.c. cubic structures, (ii) from calculation with Pauling's equation, R(1) - R(n) = 0.3 log n and (iii) by calculation for the condition of equal atomic volumes in the f.c. and b.c. cubic structures are compared as a function of RCN8. Observations and recommendations are made.