International
Tables for
Crystallography
Volume G
Definition and exchange of crystallographic data
Edited by J. R. Hester and B. McMahon

International Tables for Crystallography (2026). Vol. G. Early view chapter
https://doi.org/10.1107/97809553602060001011

Chapter 4.2 Core dictionary (coreCIF)


Index

Core dictionary version 3.3.0

_exptl_crystal.mosaicity

Name:
_exptl_crystal.mosaicity

Definition:

   
    Isotropic approximation of the distribution of mis-orientation angles
    specified in degrees of all the mosaic domain blocks in the crystal,
    represented as a standard deviation. Here, a mosaic block is a set of
    contiguous unit cells assumed to be perfectly aligned. Lower mosaicity
    indicates better ordered crystals. See, for example, Nave (1998).

    Note that many software packages estimate the mosaic rotation distribution
    differently and may combine several physical properties of the experiment
    into a single mosaic term. This term will help fit the modelled spots
    to the observed spots without necessarily being directly related to the
    physics of the crystal itself.

    Reference: Nave, C. (1998). Acta Cryst. D54, 848-853.

Type: Real

Units: degrees


The permitted range is 0. → infinity

Category:
exptl_crystal








































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