|
International
Tables for Crystallography Volume G Definition and exchange of crystallographic data Edited by J. R. Hester and B. McMahon © International Union of Crystallography 2026 |
International Tables for Crystallography (2026). Vol. G. Early view chapter
https://doi.org/10.1107/97809553602060001011 Chapter 4.2 Core dictionary (coreCIF) |
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