01433 IUPAC Gold Book - crystallinity 10.1351/goldbook.C01433 C01433 current 1 The presence of three-dimensional order on the level of atomic dimensions. Crystallinity may be detected by diffraction techniques, heat-of-fusion measurements, etc. The amount of disorder within the crystalline region is not incompatible with this concept. diffraction https://goldbook.iupac.org//terms/view/D01711 Purple Book, 1st ed., p. 74 (http://old.iupac.org/publications/books/author/metanomski.html) https://goldbook.iupac.org/terms/view/C01433/html https://goldbook.iupac.org/terms/view/C01433/json https://goldbook.iupac.org/terms/view/C01433/plain Citation: 'crystallinity' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. 10.1351/goldbook.C01433 The IUPAC Gold Book is licensed under Creative Commons Attribution-ShareAlike CC BY-SA 4.0 International (https://creativecommons.org/licenses/by-sa/4.0/) for individual terms. If you are interested in licensing the Gold Book for commercial use, please contact the IUPAC Executive Director at executivedirector@iupac.org . The International Union of Pure and Applied Chemistry (IUPAC) is continuously reviewing and, where needed, updating terms in the Compendium of Chemical Terminology (the IUPAC Gold Book). Users of these terms are encouraged to include the version of a term with its use and to check regularly for updates to term definitions that you are using. 2026-05-09T10:50:40+00:00