Samarium (III) oxide

Crystal structure
__ Sm 3+      __ O 2−
General
Surname	Samarium (III) oxide
other names	Samarium sesquioxide Disamarium trioxide Samaria
Ratio formula	Sm 2 O 3
Brief description	odorless yellowish solid
External identifiers / databases
CAS number 12060-58-1 EC number 235-043-6 ECHA InfoCard 100,031,845 PubChem 159425 Wikidata Q421401
properties
Molar mass	348.72 g mol −1
Physical state	firmly
density	8.347 g cm −3
Melting point	2325 ° C
solubility	almost insoluble in water (20 ° C)
safety instructions
GHS labeling of hazardous substances no GHS pictograms H and P phrases H: no H-phrases P: no P-phrases
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 .

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

history

Samarium (III) oxide was discovered in samarskite by Paul Émile Lecoq de Boisbaudran in 1879 .

Extraction and presentation

Samarium (III) oxide can be obtained by burning samarium in air.

${\displaystyle \mathrm {4\ Sm+3\ O_{2}\longrightarrow 2\ Sm_{2}O_{3}} }$

It can also be obtained by thermal decomposition of samarium salts such as samarium oxalate or samarium carbonate at temperatures around 700 ° C.

${\displaystyle \mathrm {Sm_{2}(CO_{3})_{3}\longrightarrow Sm_{2}O_{3}+3\ CO_{2}} }$

Samarium (III) oxide nanoparticles can be obtained by reacting samarium hydride with oxygen .

${\displaystyle \mathrm {4\ Sm_{3}H_{7}+9\ O_{2}\longrightarrow 6\ Sm_{2}O_{3}+14\ H_{2}} }$

A total of around 700 tons are produced each year.

properties

Samarium (III) oxide

Samarium (III) oxide is an odorless, yellowish solid that is insoluble in water. It occurs in a monoclinic and a cubic crystal structure, with the cubic shape being more stable and common.

use

Samarium (III) oxide is used in infrared radiation absorbing glass. In organic chemistry, it catalyzes the reaction of acyclic primary alcohols to aldehydes and ketones . Another application is the production of other samarium salts such as samarium (III) sulfide .

Individual evidence

1. ↑ ^{a b c d e f g h} data sheet samarium (III) oxide (PDF) from Merck , accessed on March 8, 2012.
2. ^ Mary Eagleson: Concise encyclopedia chemistry , p. 583 ( limited preview in Google Book Search).
3. ↑ Gerd Meyer, Lester R. Morss: Synthesis of lanthanide and actinide compounds . Springer Netherlands, 1990, ISBN 978-0-7923-1018-1 , pp. 196 ( limited preview in Google Book search).
4. ↑ ^{a b} Eugene V. Dirote: trends in nanotechnology research . 2004, ISBN 1-59454-091-8 , pp. 114 ( limited preview in Google Book search).
5. ^ John Emsley: Nature's building blocks: an AZ guide to the elements . Oxford University Press, 2003, ISBN 0-19-850340-7 , pp. 372 ( limited preview in Google Book search).
6. ↑ Pradyot Patnaik: Handbook of Inorganic Chemistry . McGraw-Hill, 2002, ISBN 0-07-049439-8 .
7. ↑ G. Meyer, Lester R. Morss (Ed.): Synthesis of Lanthanide and Actinide Compounds . Springer, 1991, ISBN 0-7923-1018-7 , pp. 328 ( limited preview in Google Book search).