why high structures having high coordination no. havve schottkey defects only?

Asked by  | 10th Apr, 2008, 01:01: PM

Expert Answer:

so that they do not collapse!!! 

  • Vacancies are sites which are usually occupied by an atom but which are unoccupied. If a neighboring atom moves to occupy the vacant site, the vacancy moves in the opposite direction to the site which used to be occupied by the moving atom. The stability of the surrounding crystal structure guarantees that the neighboring atoms will not simply collapse around the vacancy. In some materials, neighboring atoms actually move away from a vacancy, because they can better form bonds with atoms in the other directions. A vacancy (or pair of vacancies in an ionic solid) is sometimes called a Schottky defect.
  • Answered by  | 23rd May, 2008, 09:00: AM

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