Paracrystalline disorder of the first kind

{
  "id": "MLC-T-CHM-008436",
  "term": "Paracrystalline disorder of the first kind",
  "field": "Chemistry",
  "definition": "Structural disorder of a paracrystal in which atoms are displaced from their average lattice positions by uncorrelated fluctuations, mostly thermal, so each displacement is independent of the others and of distance. Long-range order of the average lattice is kept, so Bragg reflections stay sharp but lose intensity at higher scattering angles, as in the Debye-Waller effect. It contrasts with disorder of the second kind, where displacements accumulate and the reflections broaden.",
  "synonyms": [
    "uncorrelated paracrystalline disorder"
  ],
  "subject": "Polymer",
  "see_also": [
    "paracrystal"
  ],
  "references": [
    "PAC, 2011, 83, 1831. 'Definitions of terms relating to crystalline polymers (IUPAC Recommendations 2011)' on page 1848 (https://doi.org/10.1351/PAC-REC-10-11-13)"
  ],
  "url": "https://mlchart.com/terminology/chemistry/paracrystalline-disorder-of-the-first-kind/"
}