Iron (III) fluoride
Crystal structure | ||||||||||||||||
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__ Fe 3+ __ F - | ||||||||||||||||
Crystal system | ||||||||||||||||
Space group |
R 3 c (No. 167) |
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Lattice parameters |
a = 519.4 pm |
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General | ||||||||||||||||
Surname | Iron (III) fluoride | |||||||||||||||
other names |
Iron trifluoride |
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Ratio formula | FeF 3 | |||||||||||||||
Brief description |
greenish solid |
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External identifiers / databases | ||||||||||||||||
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properties | ||||||||||||||||
Molar mass | 112.84 g mol −1 | |||||||||||||||
Physical state |
firmly |
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density |
3.87 g cm −3 |
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Melting point |
1030 ° C |
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solubility |
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safety instructions | ||||||||||||||||
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As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions . |
Iron (III) fluoride is an inorganic chemical compound of iron from the group of fluorides , the salts of hydrofluoric acid .
Extraction and presentation
Iron (III) fluoride can be obtained by reacting anhydrous iron (III) chloride with hydrogen fluoride .
properties
Iron (III) fluoride is a light green solid that is very sparingly soluble in water. It crystallizes in a trigonal structure (VF 3 type, space group R 3 c (space group no. 167) ). There is also a form of iron (III) fluoride, which crystallizes in a variant of the pyrochlore structure ( cubic , space group Fd 3 m (No. 227) ). A trihydrate is also known ( tetragonal , space group P 4 / n (No. 85) , lattice parameters a = 7.846 Å , c = 3.877 Å).
use
Iron (III) fluoride is mainly used in the production of ceramics .
Individual evidence
- ↑ M. Leblanc, J. Pannetier, G. Ferey, R. de Pape: Single crystal refinement of the structure of rhombohedral FeF 3 . In: Revue de Chimie Minerale , 1985 , 22 , pp. 107-114.
- ↑ a b c d e Georg Brauer (Ed.), With the collaboration of Marianne Baudler u. a .: Handbook of Preparative Inorganic Chemistry. 3rd, revised edition. Volume I, Ferdinand Enke, Stuttgart 1975, ISBN 3-432-02328-6 , p. 275.
- ↑ a b c d e f Entry on iron trifluoride in the GESTIS substance database of the IFA , accessed on January 8, 2018(JavaScript required) .
- ↑ H. Sowa, H. Ahsbahs: Pressure-Induced Octahedron Strain in VF 3 -Type Compounds . In: Acta Crystallographica , 1998 , B54 , pp. 578-584. doi : 10.1107 / S0108768198001207 .
- ↑ R. de Paper, G. Ferey: A new form of FeF 3 with the pyrochlore structure: Soft chemistry synthesis, crystal structure, thermal transitions and structural correlations with the other forms of FeF 3 . In: Materials Research Bulletin, 1986 , 21 , pp. 971-978. doi : 10.1016 / 0025-5408 (86) 90134-0 .
- ↑ G. Teufer: The crystal structure of beta iron (III) trifluoride trihydrate, beta-FeF 3 (H 2 O) 3 . In: Acta Crystallographica , 17, 1964, p. 1480, doi: 10.1107 / S0365110X64003681 .
- ↑ entry Ferric Fluoride in CAMEO Chemicals, accessed on 7 April of 2010.