Table 1 Elastic constants, bulk, shear and Young's modulli (unit: all in GPa) of stable phases of CaC₆ as well as carbon foam (labeled C₆) at zero pressure

P

c ₁₁

c ₂₂

c ₃₃

c ₄₄

c ₅₅

c ₆₆

c ₁₂

c ₁₃

c ₂₃

B

G