Iron silicates

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Various chemical compounds of iron with substances from the group of silicates are referred to as iron silicates (also iron silicates ) .

Representation and occurrence

Iron (II) silicates are formed by fusing iron (II) oxide with quartz . They are widespread in nature and come in pure form as fayalite Fe 2 SiO 4 and its high-pressure modification ahrensite and as a mixed mineral ferrosilite Fe 2+ (Fe 2+ , Mg) [Si 2 O 6 ] or grunerite (Fe 2+) , Mg) 7 [OH | Si 4 O 11 ] 2 .

In addition, isomorphic mixtures with silicates of other metals such as olivine (Mg, Fe) 2 SiO 4 and hedenbergite (CaFe) (Si 2 O 6 ) occur in many cases . Iron (III) silicates are only found in nature in the form of double silicates , for example as Akmit NaFe [Si 2 O 6 ] and andradite Ca 3 Fe 2 [SiO 4 ] 3 . Fe 2 SiO 4 has an orthorhombic crystal structure of the olivine type with the space group Pbnm (space group no. 62, position 3) . At high pressures and temperatures, this changes into a cubic crystal structure. FeSiO 3 occurs in several crystal structures that have either a monoclinic crystal structure with the space group P 2 1 / c (space group no. 14) or an orthorhombic crystal structure with the space group Pbca (space group no. 61) . Both compounds form further crystal structures at very high pressures and temperatures. Template: room group / 62.3 Template: room group / 14 Template: room group / 61

A compound with the formula Fe 5 (SiO 4 ) 3 that does not occur in nature is also known .

It should be noted that the slag resulting from pyrotechnic copper smelting is also known as iron silicate rock or iron silicate slag for reasons of image, although some of these also contain copper and lead compounds.

properties

Ferrosilite
Iron silicates
Surname Iron (II) orthosilicate Iron (II) metasilicate
other names Ferroorthosilicate
  • Ferrometasilicate
  • Ferrosilite
Molecular formula Fe 2 SiO 4 FeSiO 3
CAS number 10179-73-4 13478-48-3
PubChem 165842
Molar mass 203.77 g mol −1 131.93 g mol −1
Physical state firmly
Brief description brown solid
Melting point 1217 ° C
density 4.34 g cm −3
solubility
GHS
labeling
no classification available
H and P phrases see above
see above

Individual evidence

  1. ^ DH Lindsley, BTC Davis, ID Macgregor: Ferrosilite (FeSiO 3 ): Synthesis at High Pressures and Temperatures . In: Science . tape 144 , 1964, pp. 73–74 , doi : 10.1126 / science.144.3614.73 , bibcode : 1964Sci ... 144 ... 73L .
  2. ↑ Spektrum Akademischer Verlag, Lexikon der Chemie: Eisensilicate , accessed on November 17, 2017
  3. ↑ a b c I. Yu. Tonkov: High PSurendra K. Saxena, Nilanjan Chatterjee, Yingwei Fei, Guoyin Shenressure Phase Transformations: A Handbook . tape 2 . CRC Press, 1992, ISBN 978-2-88124-759-0 , pp. 401 ( limited preview in Google Book search).
  4. ^ S. Mitra: High Pressure Geochemistry & Mineral Physics . S. 574 ( limited preview in Google Book search).
  5. ^ Thermodynamic Data on Oxides and Silicates: An Assessed Data Set Based on Thermochemistry and High Pressure Phase Equilibrium . Springer Science & Business Media, 2012, ISBN 978-3-642-78332-6 , p.  64 ( limited preview in Google Book search).
  6. ↑ Hans Martens, Daniel Goldmann: Recyclingtechnik: reference book for teaching and practice . Springer-Verlag, 2016, ISBN 978-3-658-02786-5 , pp. 118 ( limited preview in Google Book search).
  7. ↑ Reza Khorasani: Long-term behavior of iron silicate rock , Federal Institute for Hydrology, Events 5/2008, p. 80.
  8. ^ William M. Haynes (ed.): CRC Handbook of Chemistry and Physics, 97th Edition . CRC Press, 2016, ISBN 978-1-4987-5429-3 ( limited preview in Google Book Search).
  9. ↑ R. Blachnik (Ed.): Pocket book for chemists and physicists: Volume 3: Elements, inorganic compounds and materials, minerals . Springer-Verlag, 2013, ISBN 978-3-642-58842-6 , pp. 460 ( limited preview in Google Book Search).