Caesium peroxide

Caesium peroxide
Names
	IUPAC name Caesium peroxide
Identifiers
CAS Number	12053-70-2;
Properties
Chemical formula	Cs2O2
Appearance	Yellowish[1]
Structure
Crystal structure	Orthorhombic[2]
Related compounds
Other cations	Lithium peroxide ; Sodium peroxide ; Potassium peroxide ; Rubidium peroxide
Related caesium oxides	Caesium suboxide; Caesium monoxide; Caesium sesquioxide; Caesium superoxide; 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 caesium superoxide:[3]

2CsO₂ → Cs₂O₂ + O₂

Upon heating until 650°C, the compound will decompose to caesium monoxide and atomic oxygen:[4]

{\mathsf {Cs_{2}O_{2}\rightarrow Cs_{2}O+[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

I. I. Volnov (2012). Peroxides, Superoxides, and Ozonides of Alkali and Alkaline Earth Metals. Springer. p. 45. ISBN 9781468482522.
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.
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.
Zefirov, Nikolaj (1995). Chimičeskaja ėnciklopedija : v pjati tomach (in Bosnian). Moskva: Izdat. p. 658. ISBN 5-85270-092-4. OCLC 258155382.
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.
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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[Volnov-1] 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] 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. Wiley. 33 (8): 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. AIP Publishing. 102 (7): 074908–074908–6. Bibcode:2007JAP...102g4908S. doi:10.1063/1.2786882. ISSN 0021-8979.