Extrinsic defect

{
  "id": "MLC-T-CHM-004311",
  "term": "Extrinsic defect",
  "field": "Chemistry",
  "definition": "A type of crystal lattice imperfection caused by the presence of impurity atoms within the material. These defects can be substitutional, where an impurity atom replaces a host atom, or interstitial, where an impurity atom occupies a site between host atoms. Extrinsic defects can significantly alter the electrical, optical, and mechanical properties of a solid, such as in doped semiconductors.",
  "synonyms": [
    "extrinsic surface defect"
  ],
  "subject": "Physical and Biophysical Chemistry",
  "see_also": [
    "heterogeneous photocatalysis",
    "photocarrier",
    "photocatalytic centre",
    "recombination centre"
  ],
  "references": [
    "PAC, 2011, 83, 931. 'Glossary of terms used in photocatalysis and radiation catalysis (IUPAC Recommendations 2011)' on page 952 (https://doi.org/10.1351/PAC-REC-09-09-36)"
  ],
  "url": "https://mlchart.com/terminology/chemistry/extrinsic-defect/"
}