Practical Electron Microscopy and Database

Chapter/Index: Introduction | A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z | Appendix

Atomic Packing factor in crystals

Atomic packing factor (APF) describes how efficiently atoms fill the space within a given unit cell. Assuming the atoms are hard spheres, the APF can be given by,          ------------------------- [3030] Table 3030. Atomic packing factor (APF) in crystals. Structure Packing factor Examples Simple cubic (SC) 0.52 Polonium (Po), α-Mn Body-centered cubic (BCC) 0.68 Fe, Ti, W, Mo, Nb, Ta, K, Na, V, Zr, Cr Face-centered cubic (FCC) 0.74 Fe, Cu, Au, Pt, Ag, Pb, Ni Hexagonal close-packed (HCP) 0.74 Ti, Mg, Zn, Be, Co, Zr, Cd