Atoms in face-centered cubic (FCC) structures are closely packed, which suggests a potential for high bond strength, but this is not a definitive correlation. While FCC and hexagonal close-packed (HCP) materials often exhibit high ionic or metallic character due to their packing efficiency, this does not inherently indicate high bond energy. The isotropic nature of ionic and metallic bonding allows for efficient space filling without a strong dependence on atomic orientation. Additionally, high packing densities in surfaces lead to lower surface energy, which is distinct from bonding energy. Understanding these distinctions is crucial for accurately assessing bond strength in materials with FCC structures.
