| Type | Description | | ----------------------- | ---------------------------------- | | Vacancy | Missing atom in lattice structure | | Interstitial | Extra atom | | Substitutional impurity | Foreign atom in place of host atom | ![[crystal_defects.png]] [Source](https://opentextbc.ca/chemistry/chapter/10-5-the-solid-state-of-matter/) - Cause [[Ionic Conductivity|ionic conductivity]] in ionic crystals - Form [[Color Centers|color centers]] in ionic crystals - Create [[Recombination Mechanisms|recombination mechanisms]]