Assertion: precipitate | /r/HasProperty | a crystalline approximant
Facets:
Source sentences:
text: Currently, there is a lack of convergent beam electron diffraction patterns to establish unambiguously whether these precipitates have a perfect icosahedral symmetry or are a crystalline approximant with a very large unit cell parameter, but atomic-resolution transmission electron microscopy does not reveal any periodic crystal structure or nanoscale twins existing within such particles.