Europium (III) oxide

Crystal structure
__ Eu 3+      __ O 2−
General
Surname	Europium (III) oxide
other names	Europium sesquioxide
Ratio formula	Eu 2 O 3
Brief description	white to light pink odorless solid
External identifiers / databases
CAS number 1308-96-9 EC number 215-165-6 ECHA InfoCard 100,013,787 PubChem 159371 Wikidata Q617253
properties
Molar mass	351.92 g mol −1
Physical state	firmly
density	7.42 g cm −3
Melting point	2291 ° C
boiling point	4118 ° C
solubility	practically insoluble in water
safety instructions
GHS labeling of hazardous substances Caution H and P phrases H: 315-319-335 P: 261-305 + 351 + 338
Toxicological data	5000 mg kg −1 ( LD 50 ,  rat ,  oral )
As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

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

Extraction and presentation

After the laborious separation of the other lanthanoids from their ores, europium (III) oxalate Eu ₂ (C ₂ O ₄ ) ₃ · 10 H ₂ O is finally obtained, which is then burned to form europium oxide Eu ₂ O ₃ .

${\displaystyle \mathrm {2\ Eu_{2}(C_{2}O_{4})_{3}+3\ O_{2}\longrightarrow 2\ Eu_{2}O_{3}+12\ CO_{2}} }$

In order to obtain nanocrystals of the material, synthesis by calcination of the corresponding hydroxide or oxalate is used.

properties

Europium (III) oxide

Europium (III) oxide is a hygroscopic white to light pink odorless solid that is practically insoluble in water. It has a monoclinic crystal structure.

use

In long-wave UV light it glows intensely red and is therefore mainly used as a security color on banknotes. Europium (II) silicate can be produced by reducing europium (III) oxide with elemental europium and silicon dioxide at 1100 ° C.

Individual evidence

1. ↑ ^{a b c d e f g h} Entry for CAS no. 1308-96-9 in the GESTIS substance database of the IFA , accessed on January 25, 2012(JavaScript required) .
2. ↑ ^{a b} Datasheet Europium (III) oxide, 99.999% trace metals basis from Sigma-Aldrich , accessed on January 25, 2012 ( PDF ).
3. ↑ ^{a b} Ginya Adachi, Nobuhito Imanaka, Zhen Chuan Kang: Binary rare earth oxides. 2004, Springer Netherlands, ISBN 978-1-4020-2568-6 , p. 138 ( limited preview in Google book search).
4. ↑ Seilnacht: Europium
5. ↑ didactic chemistry: transition metal oxides as color pigments
6. ↑ C. Funk, J. Köhler, I. Lazar, D. Kajewski, K. Roleder, J. Nuss, A. Bussmann-Holder, H. Bamberger, J. van Slageren, D. Enseling, T. Jüstel, T. Schleid, Cryst. Growth Des . 2018 , 18 , 6316-6325. doi: 10.1021 / acs.cgd.8b01265