In BCC, the center atom is touched by every corner atom. In BCC total number of atoms per unit cell is $1 (\dfrac \times 8) = 2$ ….(I) So BCC has a total of 2 lattice points per unit cell. Each corner atom has only one-eighth of its volume within the unit cell. Crystal structure of Body centred cubic lattice (bcc): i) It contains 8 corner atoms and a body centred atom. In a Body-centered cubic unit cell, 8 atoms are present at each corner along with one center atom in the center of the cube. vi) Packing fraction volume of atoms (v) in a unit cell / Volume of unit cell (V) Examples: Cu, Ag, Au, Ca, Al, Pb, Pt. Packing efficiency has no physical dimensions hence it is a dimensionless quantity. Planar packing fraction (factor) for the body centred cubic (111) plane 58,834 views 441 Dislike Share Save Scott Ramsay 17.4K subscribers In this video, Parisa works through the. It is the fraction of volume in a crystal structure that is filled up or occupied by particles constituent. Packing efficiency is also known as the atomic packing factor. Hint: Packing efficiency is defined as the ratio of the volume occupied by atoms in a unit cell by the total volume of the unit cell and the efficiency of the body-centered cubic lattice is 68% and the coordination number of this BCC lattice structure is eight.
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