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Dipotassium heptafluorotantalate(V), β-K2TaF7, at 509 K

Vratislav Langer (Institutionen för kemi- och bioteknik, Oorganisk miljökemi) ; Lubomír Smrcok ; Miroslav Boca
Acta Crystallographica Section E: Structure Reports (1600-5368). Vol. E62 (2006), 4, p. i91-i93.
[Artikel, refereegranskad vetenskaplig]

Upon heating to 509 K, monoclinic α-K2TaF7 (P21/c) transforms to orthorhombic β-K2TaF7 (Pnma) which is composed of discrete K+ cations and TaF72- anions. In the anion, the Ta atom is sevenfold coordinated by F atoms, with the Ta-F distance varying from 1.88(2) to 1.965(19) Å. The two independent K+ cations are surrounded by F atoms positioned within 2.740(17)-2.979(10) and 2.989(17)-3.15(5) Å. Ta, both K and one of the four F atoms are located on a mirror plane, Wyckoff position 4c.

Nyckelord: X-ray structure, phase transition

Denna post skapades 2006-08-25.
CPL Pubid: 18572


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


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