To expert; KANIKA DALAL MAM you gave the link which says that bcc lattice don't have voids, then you tell me how come it's packing fraction remains 68%.... Which means that remaining contains voids, MAM now it's your duty to answer my question on the radius of largest atom that can be fitted in a bcc lattice. Pls maam.........

Dear student,

Please find below the solution to the query posted by you.

As you already know that the packing efficiency is the amount of space in a lattice that is occupied by atoms, if atoms are considered to be hard spheres. A bcc lattice is generally not considered a close packed arrangement as hcp and ccp. Voids are generally formed inside the close packed arrangement of hcp and ccp lattice. In a bcc lattice an atom is occupying the body center position which leaves little room for creation of a void.
Packing efficiency of a bcc lattice is 68%, which means that 68% of the lattice is occupied, the rest of the space is empty. Atoms generally do not fit in those spaces.

Hope this information will clear your doubt regarding bcc lattice.

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