Iron arsenide
Iron arsenides are chemical compounds between iron and arsenic . In some cases, other compounds with other elements are also included in these. This includes, for example, a class of high temperature superconductors such as BaFe 2 As 2 and 122 iron arsenide superconductors.
Iron arsenides are found in nature as a mineral Löllingit (FeAs 2 ) Westerveldit (FeAs) and Ferroskutterudit (FeAs 3 ).
properties
The component elements form four compounds, namely the tetragonal Fe 2 As, the Fe 3 As 2 , which only exists above 824 ° C , the orthorhombic FeAs with a manganese phosphide structure and the orthorhombic FeAs 2 . The existence of pure FeAs 3 is not considered to be certain, since the phase diagram does not show this. In chemical analyzes, the corresponding mineral ferroscutterudite showed a composition that, in addition to iron, also contained a large proportion of cobalt and small amounts of nickel and sulfur (for example Fe 0.600 Co 0.394 Ni 0.002 As 2.888 S 0.116 ). FeAs 2 is a diamagnetic semiconductor with a band gap of 0.22 eV.
Iron arsenide | |||||||||||
Surname | Iron arsenide | Iron diarsenide | Iron triarsenide | Iron arsenide | |||||||
other names | Westerveldite iron (III) arsenide |
Lollingite | Ferro cutter audit | ||||||||
CAS number | 12044-16-5 | 12006-21-2 | 12005-88-8 | ||||||||
PubChem | 82876 | 71310805 | 71310806 | ||||||||
Molecular formula | FeAs | FeAs 2 | FeAs 3 | Fe 2 As | |||||||
Molar mass | 130.77 g mol −1 | 205.69 g mol −1 | 280.61 g mol −1 | 186.61 g mol −1 | |||||||
Physical state | firmly | ||||||||||
Brief description | white solid | odorless gray solid | |||||||||
Melting point | 1020 ° C | 990 ° C | > 400 ° C | ||||||||
boiling point | |||||||||||
density | 7.83 g cm −3 | 7.4 g cm −3 | |||||||||
solubility | slightly soluble in water | practically insoluble in water | |||||||||
GHS labeling |
|
|
|
|
|||||||
H and P phrases | 301-331-410 | 301-331-410 | see above | 301-331-410 | |||||||
261-273-301 + 310-311-501 | 261-273-301 + 310-311-501 | see above | 261-273-301 + 310-311-501 |
presentation
The iron arsenides FeAs and FeAs 2 can be produced by electrolysis of melts made of iron (III) oxide or iron (III) chloride and alkali metal arsenates . Direct synthesis from the elements is also possible.
Individual evidence
- ↑ Max Planck Society: Iron Arsenide Superconductors - An Example of the Central Role of Crystal Growing in Solid State Research , accessed on May 30, 2018
- ↑ James Huheey, Ellen Keiter, Richard Keiter: Inorganic chemistry principles of structure and reactivity . Walter de Gruyter GmbH & Co KG, 2014, ISBN 978-3-11-037400-1 , p. 301 ( limited preview in Google Book search).
- ^ A b O. Kubaschewski: IRON — Binary Phase Diagrams . Springer Science & Business Media, 2013, ISBN 978-3-662-08024-5 , p. 10 ( limited preview in Google Book search).
- ↑ Ferroscutterudite . In: John W. Anthony, Richard A. Bideaux, Kenneth W. Bladh, Monte C. Nichols (Eds.): Handbook of Mineralogy, Mineralogical Society of America . 2001 ( handbookofmineralogy.org [PDF; accessed May 31, 2018]).
- ↑ Stefan Kiefer, Juraj Majzlan, Martin Chovan, Martin Števko: Mineral compositions and phase relations of the complex sulfarsenides and arsenides from Dobšiná (Western Carpathians, Slovakia) . In: Ore Geology Reviews . tape 89 , 2017, p. 894 , doi : 10.1016 / j.oregeorev.2017.07.026 .
- ^ Albert KL Fan, Gerald H. Rosenthal, Howard L. McKinzie, Aaron Wold: Preparation and properties of FeAs 2 and FeSb 2 . In: Journal of Solid State Chemistry . tape 5 , 1972, p. 136 , doi : 10.1016 / 0022-4596 (72) 90021-7 .
- ↑ a b c d Dale L. Perry: Handbook of Inorganic Compounds, Second Edition . CRC Press, 2016, ISBN 978-1-4398-1462-8 , pp. 214 ( limited preview in Google Book search).
- ↑ a b Data sheet Iron arsenide, 99.5% (metals basis) at AlfaAesar, accessed on May 30, 2018 ( PDF )(JavaScript required) .
- ↑ a b c data sheet Iron diarsenide, pieces, 99.5% trace metals basis at Sigma-Aldrich , accessed on May 30, 2018 ( PDF ).
- ↑ a b Datasheet Iron arsenide, pieces, 99.5% trace metals basis at Sigma-Aldrich , accessed on May 30, 2018 ( PDF ).
- ↑ Data sheet Iron (III) arsenide, 99.5% trace metals basis from Sigma-Aldrich , accessed on May 30, 2018 ( PDF ).
- ↑ Paul Hagenmuller: Preparative Methods in Solid State Chemistry . Elsevier, 2012, ISBN 0-323-14436-5 , pp. 299 ( limited preview in Google Book search).