Tungsten Fluorides: Syntheses and Electrochemical Characterization in the FLINAK Molten Salt Eutectic
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- 作者：Sven E. Eklund ; James Q. Chambers ; Gleb Mamantov ; Jon Diminnie ; and Craig E. Barnes
- 刊名：Inorganic Chemistry
- 出版年：2001
- 出版时间：February 12, 2001
- 年：2001
- 卷：40
- 期：4
- 页码：715 - 722
- 全文大小：121K
- 年卷期：v.40,no.4(February 12, 2001)
- ISSN：1520-510X
文摘
The following tungsten fluorides have been synthesized by simple addition reactions or by reduction with tungstenmetal at elevated temperature: KWF7, K2WF8, MWF6 (M = K, Na, Rb, Cs), K2WF7, M3WF8 (M = K, Na, Rb),and K3WF6. The compounds were characterized by their Raman spectra and by cyclic voltammetry in the moltenFLINAK eutectic melt (46.5, 11.5, and 42.0 mol % of LiF, NaF, and KF, respectively) at 475-800 
C. X-raycrystal structures are reported for two new compounds K2WF7 and K3WF6. The crystals of K2WF7 wereorthorhombic, space group Pnma (No. 62) with a = 9.800(2) Å, b = 5.7360(11) Å, c = 11.723(2) Å, and Z =4. Crystals of K3WF6 were cubic, space group Fm
(No. 225) with a = b = c = 8.9160(10) Å, Z = 4.Electrodeposition of tungsten metal on Pt from FLINAK, prepared by the addition of WF6 gas and metallictungsten to the melt, is suggested to result from reduction of an equilibrium mixture of WF83- and WF63-.
C. X-raycrystal structures are reported for two new compounds K2WF7 and K3WF6. The crystals of K2WF7 wereorthorhombic, space group Pnma (No. 62) with a = 9.800(2) Å, b = 5.7360(11) Å, c = 11.723(2) Å, and Z =4. Crystals of K3WF6 were cubic, space group Fm (No. 225) with a = b = c = 8.9160(10) Å, Z = 4.Electrodeposition of tungsten metal on Pt from FLINAK, prepared by the addition of WF6 gas and metallictungsten to the melt, is suggested to result from reduction of an equilibrium mixture of WF83- and WF63-.