Caesium peroxide
Chemical compound / From Wikipedia, the free encyclopedia
Caesium peroxide or cesium peroxide is an inorganic compound of caesium and oxygen with the chemical formula Cs2O2. It can be formed from caesium metal by adding a stoichiometric amount in ammonia solution, or oxidizing the solid metal directly.[1]
- 2 Cs + O2 → Cs2O2
Quick Facts Names, Identifiers ...
Names | |
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IUPAC name
Caesium peroxide | |
Identifiers | |
Properties | |
Cs2O2 | |
Molar mass | 297.809 g·mol−1 |
Appearance | Yellowish[1] |
Structure | |
Orthorhombic[2] | |
Related compounds | |
Other cations |
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Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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It can also be formed by the thermal decomposition of caesium superoxide:[3]
- 2 CsO2 → Cs2O2 + O2
Upon heating until 650 °C, the compound will decompose to caesium monoxide and atomic oxygen:[4]
- Cs2O2 → Cs2O + [O]
Caesium peroxide shows a Raman vibration at 743 cm−1, due to the presence of the peroxide ions.[5] The compound is often used as a coating for photocathodes, due to its low work function.[6]