Caesium peroxide

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Caesium peroxide
Cs2O2.png
Identifiers
Properties
Cs2O2
Appearance Yellowish[1]
Structure
Orthorhombic[2]
Related compounds
Other cations
 Lithium peroxide
Sodium peroxide
Potassium peroxide
Rubidium peroxide
Related caesium oxides
Caesium monoxide
Caesium sesquioxide

Caesium ozonide
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

Caesium peroxide or cesium peroxide is a compound of caesium and oxygen. It can be formed from caesium metal by adding a stoichiometric amount in ammonia solution, or oxidizing the solid metal directly.[1]

2Cs + O2 → Cs2O2

It can also be formed by the thermal decomposition of :[3]

2CsO2 → Cs2O2 + O2

Upon heating, the compound will itself decompose to caesium monoxide:

2Cs2O2 → 2 Cs2O + O2

Caesium peroxide shows a Raman vibration at 743 cm−1, due to the presence of the peroxide ions.[4] The compound is often used as a coating for photocathodes, due to its low work function.[5]

References[]

  1. ^ a b I. I. Volnov (2012). Peroxides, Superoxides, and Ozonides of Alkali and Alkaline Earth Metals. Springer. p. 45. ISBN 9781468482522.
  2. ^ Band, A.; Albu-Yaron, A.; Livneh, T.; Cohen, H.; Feldman, Y.; Shimon, L.; Popovitz-Biro, R.; Lyahovitskaya, V.; Tenne, R. (2004-07-27). "Characterization of Oxides of Cesium". The Journal of Physical Chemistry B. American Chemical Society (ACS). 108 (33): 12360–12367. doi:10.1021/jp036432o. ISSN 1520-6106.
  3. ^ Berardinelli, S. P.; Kraus, D. L. (1974-01-01). "Thermal decomposition of the higher oxides of cesium in the temperature range 320-500.deg". Inorganic Chemistry. American Chemical Society (ACS). 13 (1): 189–191. doi:10.1021/ic50131a037. ISSN 0020-1669.
  4. ^ Livneh, Tsachi; Band, Alisa; Tenne, Reshef (2002). "Raman scattering from the peroxide ion in Cs2O2". Journal of Raman Spectroscopy. Wiley. 33 (8): 675–676. Bibcode:2002JRSp...33..675L. doi:10.1002/jrs.900. ISSN 0377-0486.
  5. ^ Sun, Yun; Liu, Zhi; Pianetta, Piero; Lee, Dong-Ick (2007). "Formation of cesium peroxide and cesium superoxide on InP photocathodes activated by cesium and oxygen". Journal of Applied Physics. AIP Publishing. 102 (7): 074908–074908–6. Bibcode:2007JAP...102g4908S. doi:10.1063/1.2786882. ISSN 0021-8979.


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