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Caesium peroxide

Summary

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]

Caesium peroxide
Names
IUPAC name
Caesium peroxide
Identifiers
  • 12053-70-2
Properties
Cs2O2
Molar mass 297.809 g·mol−1
Appearance Yellowish[1]
Structure
Orthorhombic[2]
Related compounds
Other cations
Related caesium oxides
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references
2 Cs + O2 → Cs2O2

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]

References edit

  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. 108 (33). American Chemical Society (ACS): 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. 13 (1). American Chemical Society (ACS): 189–191. doi:10.1021/ic50131a037. ISSN 0020-1669.
  4. ^ Zefirov, Nikolaj (1995). Chimičeskaja ėnciklopedija : v pjati tomach (in Bosnian). Moskva: Izdat. p. 658. ISBN 5-85270-092-4. OCLC 258155382.
  5. ^ Livneh, Tsachi; Band, Alisa; Tenne, Reshef (2002). "Raman scattering from the peroxide ion in Cs2O2". Journal of Raman Spectroscopy. 33 (8). Wiley: 675–676. Bibcode:2002JRSp...33..675L. doi:10.1002/jrs.900. ISSN 0377-0486.
  6. ^ 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. 102 (7). AIP Publishing: 074908–074908–6. Bibcode:2007JAP...102g4908S. doi:10.1063/1.2786882. ISSN 0021-8979.

External links edit

 
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