From Online Dictionary of Crystallography
Revision as of 12:37, 26 September 2017 by GervaisChapuis
A powder is defined in EN-1330-11 (2007) as a 'large number of crystallites and/or particles (i.e. grains, agglomerates or aggregates; crystalline or non-crystalline) irrespective of any adhesion between them' and thus can be a loose powder (in the sense of common language), a solid block, a thin film or even a liquid. An ideal powder is represented by a virtually unlimited number of sufficiently sized, randomly oriented and spherical crystallites.