Physics - Solid State Physics - Crystal structure and lattices - Crystal Structure Problems

7 problems. P1: 'FCC unit cell: atoms at 8 corners (each shared by 8 cells) + 6 faces (each shared by 2 cells). Total atoms = 8×(1/8) + 6×(1/2) = ___' (4). P2: 'BCC: 8 corners + 1 center. Atoms per cell = ___' (2). P3: 'FCC packing fraction: atoms touch along face diagonal = 4r = a√2. So a = 2√2 r.