![]() Hence atoms occupy 52.35% off the volume of the unit cell.Įach atom has 8 equidistant nearest neighbors. Therefore a=2R,where R is the radius of each atom In this structure the atoms touch each other along the sides of the cube. Since the atoms are present only at corners, the number of atoms per unit cell is given by Hence only 1/8th of the volume of the atom lies in each cell. Hence its co-ordination number is 6.Įight unit cells share each atom at the corner. In simple cubic structure each atom consists of 6 equidistant nearest neighbours. If the number of atoms per unit cell are n and if V a is the volume of atoms in the unit cell and V is the volume of the unit cell then,Ĭalculation of Atomic packing factor for different crystal systems It is defined as the ratio of volume occupied by atoms in unit cell to the volume of the unit cell. ![]() It is the fraction of space occupied by atoms in a unit cell. (3) Atomic packing factor (APF) or Packing fraction: ![]() It is the distance between two nearest neighbors in a crystal structure. It is the number of equidistant nearest neighbors that an atom has in a crystal structure. Coordination number and Atomic packing factor Definition
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