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Chemistry · L5 · Schottky vs Frenkel Defect Formation

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A decision flow for classifying a point defect in an ionic crystal as Schottky (a matched pair of vacancies) or Frenkel (a displaced ion plus a vacancy), by whether an ion actually leaves the crystal.

by @openstemUpdated Chemistry
Point defect forms in an ionic crystalDoes an ion leave the lattice entirely,or move to a nearby interstitial site?Schottky defectFrenkel defectCation vacancy + anion vacancy(both sites empty)Cation vacancy + the same cationnow sitting in an interstitial siteElectroneutrality preserved:equal + and - charge removedElectroneutrality preserved:total ion count unchangedFavored when cation and anionare similar in size, e.g. NaClFavored when the cation is muchsmaller than the anion, e.g. AgBrLeaves entirely — a matched pair of vacancies formsMoves to an interstitial site, still inside the crystal

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