Europium (II, III) oxide

Crystal structure
__ Eu 3+      __ Eu 2+      __ O 2−
General
Surname	Europium (II, III) oxide
other names	Triopium tetraoxide
Ratio formula	Eu 3 O 4
Brief description	red-brown to almost black solid
External identifiers / databases
CAS number 12061-63-1 Wikidata Q4332814
properties
Molar mass	519.9 g mol −1
Physical state	firmly
density	8.10 g cm −3
Melting point	2000 ° C
safety instructions
GHS hazard labeling no classification available
As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Europium (II, III) oxide is a chemical compound of europium from the group of oxides .

Extraction and presentation

Europium (II, III) oxide can be obtained by reacting europium (III) oxide with an excess of europium oxychloride and lithium hydride under hydrogen at 950 ° C.

${\displaystyle \mathrm {2\ Eu_{2}O_{3}+2\ EuOCl+2\ LiH\longrightarrow 2\ Eu_{3}O_{4}+2\ LiCl+H_{2}} }$

The compound can also be synthesized from europium (III) oxide with europium (II) oxide , europium or hydrogen .

properties

In powder form, europium (II, III) oxide is a red-brown to almost black solid, depending on the particle size, which is stable in air for some time. When left in the open for a long time, the compound turns into a mixture of europium (III) hydroxide and europium (II) hydroxide hydrate. When heated to 300–400 ° C in air, it is oxidized to europium (III) oxide. Europium (II, III) oxide has an orthorhombic crystal structure with the space group Pnam (space group no. 62, position 6) and the lattice parameters a = 1009 pm, b = 1205 pm, c = 350.2 pm. It is antiferromagnetic or metamagnetic.

Individual evidence

1. ↑ ^{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. 1091.
2. ↑ Jane E. Macintyre: Dictionary of Inorganic Compounds . CRC Press, 1992, ISBN 0-412-30120-2 , pp. 3126 ( limited preview in Google Book search).
3. ↑ This substance has either not yet been classified with regard to its hazardousness or a reliable and citable source has not yet been found.
4. ↑ RC Rau: The crystal structure of Eu3O4. In: Acta Crystallographica. 20, pp. 716-723, doi : 10.1107 / S0365110X66001737 .
5. ↑ Advances in Inorganic Chemistry and Radiochemistry . Academic Press, 1977, ISBN 0-08-057869-1 , pp. 42 ( limited preview in Google Book search).