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Ca-10((CrO4)-O-V)(6)((CrO4)-O-VI), a disordered mixed-valence chromium compound exhibiting inversion twinning

D. Gyepesova ; Vratislav Langer (Institutionen för kemi- och bioteknik, Oorganisk miljökemi)
Acta Crystallographica Section C-Crystal Structure Communications (0108-2701). Vol. 69 (2013), 2, p. 111-113.
[Artikel, refereegranskad vetenskaplig]

The structure analysis of so-called 9CaO center dot 4CrO(3)center dot Cr2O3 proved it to be the title compound, decacalcium hexakis[chromate(V)] chromate(VI), with the simultaneous presence of unusual chromium oxidation states. The structure determination was carried out on a crystal that had inversion twinning. The (CrO4)-O-VI tetrahedron is situated on a threefold axis and is disordered over two possible orientations that share three O atoms, while the (CrO4)-O-V tetrahedra are in general positions and are ordered. The charge is balanced by Ca2+ cations, one of which is located on a threefold axis. The Ca2+ ions are coordinated by six, seven or eight O atoms. The compound is a significant phase in the CaO-CrOx system and its formation reduces the refractoriness of calcium-rich compositions in an oxidizing atmosphere.

Nyckelord: crystal-structure, states

Denna post skapades 2013-03-28.
CPL Pubid: 175154


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Institutioner (Chalmers)

Institutionen för kemi- och bioteknik, Oorganisk miljökemi (2005-2014)


Oorganisk kemi

Chalmers infrastruktur