Manganese (II, III) oxide
Crystal structure | |||||||||||||||||||
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__ Mn 2+ __ Mn 3+ __ O 2− | |||||||||||||||||||
General | |||||||||||||||||||
Surname | Manganese (II, III) oxide | ||||||||||||||||||
other names |
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Ratio formula | Mn 3 O 4 | ||||||||||||||||||
Brief description |
dark red-brown to black odorless powder |
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External identifiers / databases | |||||||||||||||||||
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properties | |||||||||||||||||||
Molar mass | 228.81 g mol −1 | ||||||||||||||||||
Physical state |
firmly |
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density |
4.86 g cm −3 |
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Melting point |
1705 ° C |
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boiling point |
2847 ° C |
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solubility |
almost insoluble in water |
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safety instructions | |||||||||||||||||||
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MAK |
0.2 mg m −3 |
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As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions . |
Manganese (II, III) oxide , also known as trimanganese tetroxide, is an oxide of manganese in which the metal occurs in oxidation states + II and + III. It belongs to the class of spinels , which have the general formula AB 2 Ch 4 . A is a metal in the + II oxidation state, B a metal in the + III oxidation state and Ch is a chalcogen in the -II oxidation state, usually oxygen or sulfur .
Occurrence
Manganese (II, III) oxide occurs naturally in the mineral hausmannite .
Extraction and presentation
Manganese (II, III) oxide is formed when manganese dioxide (MnO 2 ) decomposes at high temperatures and when organo-manganese compounds such as methylcyclopentadienyl-manganese-tricarbonyl (MMT) are burned .
properties
Manganese (II, III) oxide crystallizes in a spinel structure that is tetragonally distorted by the Jahn-Teller effect .
use
Manganese (II, III) oxide is used as a feed additive as well as for the production of semiconductors and magnetic materials.
Individual evidence
- ↑ a b c d e f g h Entry for CAS no. 1317-35-7 in the GESTIS substance database of the IFA , accessed on April 1, 2017 (JavaScript required)
- ↑ www.oehha.ca.gov ( Memento of the original from October 13, 2009 in the Internet Archive ) Info: The archive link was automatically inserted and not yet checked. Please check the original and archive link according to the instructions and then remove this notice. (PDF; 24 kB)
- ^ AF Holleman , E. Wiberg , N. Wiberg : Textbook of Inorganic Chemistry . 102nd edition. Walter de Gruyter, Berlin 2007, ISBN 978-3-11-017770-1 , pp. 1614-1615.
- ↑ http://eur-lex.europa.eu/ (PDF)