1. Uses

2. Preparations

3. Reactions

4. 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

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• The five senses
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• The five star stories
• The Five Star Stories