Caesium monoxide
Appearance
![]() Caesium cations, Cs+ Oxide anions, O2− | |
Names | |
---|---|
IUPAC name
Caesium oxide
| |
Other names
Cesium oxide (US)
| |
Identifiers | |
3D model (
JSmol ) |
|
ChemSpider | |
ECHA InfoCard
|
100.039.693 |
EC Number |
|
PubChem CID
|
|
| |
SMILES
| |
Properties | |
Cs2O | |
Molar mass | 281.810 g·mol−1 |
Appearance | Yellow-orange solid |
Density | 4.65 g/cm3, solid |
Melting point | 490 °C (914 °F; 763 K) (under N2) |
Reacts to form CsOH | |
1534.0·10−6 cm3/mol | |
Structure | |
hexagonal )
| |
Thermochemistry | |
Heat capacity (C)
|
76.0 J/(K·mol) |
Std molar
entropy (S⦵298) |
146.9 J/(K·mol) |
Std enthalpy of (ΔfH⦵298)formation |
−345.8 kJ/mol |
Hazards | |
Occupational safety and health (OHS/OSH): | |
Main hazards
|
Corrosive and Superbase |
GHS labelling: | |
![]() ![]() | |
NFPA 704 (fire diamond) | |
Flash point | non-flammable |
Related compounds | |
Other anions
|
|
Other cations
|
|
Related compounds
|
Caesium hydroxide |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
|
Caesium monoxide or caesium oxide is a
hexagonal crystals.[1]
Uses
Caesium oxide is used in
TV camera tubes[3]
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.[4] It is a good electron emitter; however, its high vapor pressure limits its usefulness.[5]
Reactions
Elemental magnesium reduces caesium oxide to elemental caesium, forming magnesium oxide as a side-product:[6][7]
- Cs2O + Mg → 2 Cs + MgO
Cs2O is
CsOH
on contact with water.
References
- ^ ISBN 0-8493-0487-3..
- ISBN 978-0-08-022057-4..
- ISBN 978-0-7923-7206-6
- ISBN 978-0-471-81974-5
- 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