Samarium(III) oxide

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Samarium(III) oxide
Samarium(III) oxide
Names
Other names
samarium sesquioxide
Identifiers
12060-58-1 YesY
ChemSpider 140199 YesY
EC Number 235-043-6
Jmol 3D model Interactive image
PubChem 159425
  • InChI=1S/3O.2Sm/q3*-2;2*+3 YesY
    Key: FKTOIHSPIPYAPE-UHFFFAOYSA-N YesY
  • [Sm+3].[Sm+3].[O-2].[O-2].[O-2]
Properties
Sm2O3
Molar mass 348.72 g/mol
Appearance yellow-white crystals
Density 8.347 g/cm3
Melting point 2,335 °C (4,235 °F; 2,608 K)
insoluble
Structure
cubic
Vapor pressure {{{value}}}
Related compounds
Other anions
Samarium(III) chloride
Other cations
Promethium(III) oxide, Europium(III) oxide
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
YesY verify (what is YesYN ?)
Infobox references

Samarium(III) oxide (Sm2O3) is a chemical compound.

Uses

Samarium(III) oxide is used in optical and infrared absorbing glass to absorb infrared radiation. Also, it is used as a neutron absorber in control rods for nuclear power reactors. The oxide catalyzes dehydration of acyclic primary alcohols to aldehydes and ketones. Another use involves preparation of other samarium salts. [1]

Preparations

Samarium(III) oxide may be prepared by two methods:

1. thermal decomposition of samarium(III) carbonate, hydroxide, nitrate, oxalate or sulfate:

Sm2(CO3)3 → Sm2O3 + 3 CO2

2. by burning the metal in air or oxygen at a temperature above 150 °C:

4 Sm + 3 O2 → 2 Sm2O3

Reactions

Samarium(III) oxide dissolves in mineral acids, forming salts upon evaporation and crystallization:

Sm2O3 + 6 HCl → 2 SmCl3 + 3 H2O

The oxide can be reduced to metallic samarium by heating with a reducing agent, such as hydrogen or carbon monoxide, at elevated temperatures.

References

  1. Pradyot Patnaik. Handbook of Inorganic Chemicals. McGraw-Hill, 2002, ISBN 0-07-049439-8


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