Iron (III) fluoride

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Crystal structure
Structural formula of iron (III) fluoride
__ Fe 3+      __ F -
Crystal system

trigonal

Space group

R 3 c (No. 167)Template: room group / 167

Lattice parameters

a = 519.4 pm
c = 1333.6 pm

General
Surname Iron (III) fluoride
other names

Iron trifluoride

Ratio formula FeF 3
Brief description

greenish solid

External identifiers / databases
CAS number 7783-50-8
EC number 232-002-4
ECHA InfoCard 100.029.093
PubChem 24552
Wikidata Q419700
properties
Molar mass 112.84 g mol −1
Physical state

firmly

density

3.87 g cm −3

Melting point

1030 ° C

solubility
  • very heavy in water (0.91 g l −1 at 25 ° C)
  • easily in dilute hydrofluoric acid
  • insoluble in alcohol, ether and benzene.
safety instructions
GHS labeling of hazardous substances
05 - Corrosive 07 - Warning

danger

H and P phrases H: 302 + 312 + 332-314
P: 260-280-301 + 312 + 330-303 + 361 + 353-304 + 340 + 310-305 + 351 + 338
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). Template: room group / 167Template: room group / 227Template: room group / 85

use

Iron (III) fluoride is mainly used in the production of ceramics .

Individual evidence

  1. ↑ 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.
  2. ↑ 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.
  3. ↑ 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) .
  4. ↑ 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 .
  5. ↑ 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 .
  6. ↑ 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 .
  7. ↑ entry Ferric Fluoride in CAMEO Chemicals, accessed on 7 April of 2010.