Brittle metals
The group of brittle metals consists of the metallic modifications of the elements arsenic ( gray metallic arsenic ), antimony and bismuth . They each crystallize in a hexagonal rhombohedral lattice . The crystals are composed of corrugated six rings that form double layers.
The special feature of the brittle metals, which gives them their name, is that they are very brittle , although they are already classed as semimetals (arsenic, antimony) or metals . They can be ground in ball mills , for example .
In the case of brittle metals, the melts have a higher density than the solids . The reason lies in the stability of the crystal structure with relatively small coordination numbers .
Individual evidence
- ↑ a b Chemgapedia: Learning unit: Arsenic, Antimony, Bismuth. Retrieved March 22, 2010.
- ↑ Helmut Schrätze : The emergence of endogenous ore deposits. Walter de Gruyter, Berlin et al. 1986, ISBN 3-11-009749-4 , p. 199.