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| Names | |
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| IUPAC name Caesium oxide | |
| Other names Cesium oxide (US) | |
| Identifiers | |
| CAS Number | |
| 3D model (JSmol) | |
| ChemSpider | |
| ECHA InfoCard | 100.039.693 
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| EC Number |
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| PubChem CID | |
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SMILES
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| Properties | |
| Chemical formula | Cs2O |
| Molar mass | 281.810 g·mol |
| Appearance | Yellow-orange solid |
| Density | 4.65 g/cm, solid |
| Melting point | 490 °C (914 °F; 763 K) (under N2) |
| Solubility in water | Reacts to form CsOH |
| Magnetic susceptibility (χ) | 1534.0·10 cm/mol |
| Structure | |
| Crystal structure | anti-CdCl2 (hexagonal) |
| Thermochemistry | |
| Heat capacity (C) | 76.0 J/(K·mol) |
| Std molar entropy (S298) |
146.9 J/(K·mol) |
| Std enthalpy of formation (ΔfH298) |
−345.8 kJ/mol |
| Hazards | |
| Occupational safety and health (OHS/OSH): | |
| Main hazards | Corrosive and Superbase |
| GHS labelling: | |
| Pictograms |  
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| NFPA 704 (fire diamond) |
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| Flash point | non-flammable |
| Related compounds | |
| Other anions | |
| Other cations | |
| Related caesium oxides | |
| Related compounds | Caesium hydroxide |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C , 100 kPa).
 Y verify (what is ?)
Infobox references
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Caesium monoxide or caesium oxide is a chemical compound with the chemical formula Cs2O. It is the simplest and most common oxide of the caesium. It forms yellow-orange hexagonal crystals.
Uses
Caesium oxide is used in photocathodes to detect infrared signals in devices such as image intensifiers, vacuum photodiodes, photomultipliers, and TV camera tubes L. R. Koller described the first modern photoemissive surface in 1929–1930 as a layer of caesium on a layer of caesium oxide on a layer of silver. It is a good electron emitter; however, its high vapor pressure limits its usefulness.
Reactions
Elemental magnesium reduces caesium oxide to elemental caesium, forming magnesium oxide as a side-product:
- Cs2O + Mg → 2 Cs + MgO
Cs2O is hygroscopic, forming the corrosive CsOH on contact with water.
References
- ^ Lide, David R., ed. (2006). CRC Handbook of Chemistry and Physics (87th ed.). Boca Raton, Florida: CRC Press. pp. 451, 514. ISBN 0-8493-0487-3..
- Greenwood, Norman N.; Earnshaw, Alan (1984). Chemistry of the Elements. Oxford: Pergamon Press. pp. 97–100. ISBN 978-0-08-022057-4..
- Capper, Peter; Elliott, C. T. (2000), Infrared Detectors and Emitters, Springer, p. 14, ISBN 978-0-7923-7206-6
- Busch, Kenneth W.; Busch, Marianna A. (1990), Multielement Detection Systems for Spectrochemical Analysis, Wiley-Interscience, p. 12, ISBN 978-0-471-81974-5
- Boolchand, Punit, ed. (2000), Insulating and Semiconducting Glasses, World Scientific, p. 855, Bibcode:2000isg..book.....B, ISBN 978-981-02-3673-1
- Turner Jr., Francis M., ed. (1920), The Condensed Chemical Dictionary, New York: Chemical Catalog Co., p. 121
- Arora, M.G. (1997), S-Block Elements, New Delhi: Anmol Publications, p. 13, ISBN 978-81-7488-562-3
| Caesium compounds | |
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