Schottky defect

A Schottky defect is a type of point defect in a crystal lattice named after Walter H. Schottky. The defect forms when oppositely charged ions leave their lattice sites, creating vacancies. These vacancies are formed in stoichiometric units, to maintain an overall neutral charge in the ionic solid. The vacancies are then free to move about as their own entities. Each vacancy is a separate Schottky defect. Normally these defects will lead to a decrease in the density of the crystal. The following are the chemical equations in Kröger-Vink Notation for the formation of Schottky defects in TiO₂ and BaTiO₃.

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This can be illustrated schematically with a two-dimensional diagram of a sodium chloride crystal lattice:

The defect-free NaCl structure

Schottky defects within the NaCl structure

See also

• Frenkel defect
• Wigner effect
• Crystallographic defects

References

Kittel, Charles, Introduction to Solid State Physics - 8th ed. Wiley, 2005. ISBN 0-471-41526-X.

External links

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