Chromium (II) oxide
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| __ Cr 2+ __ O 2− | ||||||||||
| General | ||||||||||
| Surname | Chromium (II) oxide | |||||||||
| other names |
Chromium monoxide |
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| Ratio formula | CrO | |||||||||
| Brief description |
black solid |
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| properties | ||||||||||
| Molar mass | 68.00 g mol −1 | |||||||||
| Physical state |
firmly |
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| As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions . | ||||||||||
Chromium (II) oxide (CrO) is an inorganic chemical compound of chromium and oxygen (more precisely an oxide of chromium).
Extraction and presentation
Chromium (II) oxide can be obtained by reducing chromium (III) oxide with phosphinic acid:
Black chromium (II) oxide is also formed from the thermal decomposition of chromium hexacarbonyl at 250 to 550 ° C in a vacuum or from the reaction of chromium amalgam with nitric acid .
A hexagonal brown-red crystal powder can be obtained by reducing chromium (III) oxide with hydrogen .
properties
Chromium (II) oxide has a sodium chloride structure and disproportionates into chromium and chromium (III) oxide at higher temperatures. It does not exist in compact form, but can grow on cubic substrates as Cr x O (0.67 <x <1).
use
Chromium (II) oxide is used as a component of toner materials and as a component and intermediate product of chromium oxide thin-film structures in the electronics industry.
Web links
Individual evidence
- ^ A b c d A. F. Holleman , E. Wiberg , N. Wiberg : Textbook of Inorganic Chemistry . 101st edition. Walter de Gruyter, Berlin 1995, ISBN 3-11-012641-9 , p. 1454.
- ↑ This substance has either not yet been classified with regard to its hazardousness or a reliable and citable source has not yet been found.
- ↑ a b Kirk-Othmer encyclopedia of chemical technology . John Wiley & Sons, 2004, ISBN 0-471-48517-9 , pp. 268 ( limited preview in Google Book search).
- ↑ a b Tjipke Hibma: THIN LAYERS OF TRANSITION METAL OXIDES (PPT; 5.9 MB)
- ↑ G. Brauer, H. Reuther, H. Walz, KH Zapp: About chromium (II) oxide. In: Journal of Inorganic and General Chemistry. 369, 1969, pp. 144-153, doi: 10.1002 / zaac.19693690305 .
- ↑ Rogojanu, Oana Corina: Stabilizing CrO by epitaxial growth , dissertation University of Groningen 2002, ( summary ( memento of the original from April 26, 2006 in the Internet Archive ) Info: The archive link has been inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this note .; PDF; 56 kB)
- ↑ Rogojanu, Oana Corina: Stabilizing CrO by epitaxial growth , dissertation University of Groningen 2002, ( Chapter 4 ( page no longer available , search in web archives ) Info: The link was automatically marked as defective. Please check the link according to the instructions and then remove it Note .; PDF; 1.1 MB)
