Loading AI tools
Chemical compound From Wikipedia, the free encyclopedia
Caesium chromate or cesium chromate is an inorganic compound with the formula Cs2CrO4. It is a yellow crystalline solid that is the caesium salt of chromic acid, and it crystallises in the orthorhombic system.
Names | |
---|---|
IUPAC name
Caesium chromate | |
Other names
Dicaesium chromate | |
Identifiers | |
3D model (JSmol) |
|
ChemSpider | |
ECHA InfoCard | 100.033.296 |
EC Number |
|
PubChem CID |
|
CompTox Dashboard (EPA) |
|
| |
| |
Properties[1] | |
Cs2CrO4 | |
Appearance | Yellow crystalline solid |
Density | 4.237 g/cm3 |
Melting point | 954 to 961 °C (1,749 to 1,762 °F; 1,227 to 1,234 K) |
45.50 g/100 g (25 °C) | |
Structure | |
orthorhombic | |
Pnma (№ 62) | |
a = 8.368 Å, b = 6.226 Å, c = 11.135 Å | |
Formula units (Z) |
4 |
Hazards | |
Occupational safety and health (OHS/OSH): | |
Main hazards |
highly toxic, carcinogenic, oxidiser, environmental hazard |
GHS labelling: | |
Flash point | Non-flammable |
Related compounds | |
Other anions |
Caesium sulfate |
Other cations |
Sodium chromate Potassium chromate Ammonium chromate |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
|
Its major application in the past was for the production of caesium vapour during vacuum tube manufacture.[2] Currently it is only used as the precursor for other compounds of academic interest.[3][4]
Caesium chromate is mainly obtained from the reaction of chromium(VI) oxide with caesium carbonate, wherein carbon dioxide gas is evolved:[3]
Alternatively, salt metathesis between potassium chromate and caesium chloride can be performed:[4]
Finally, caesium dichromate (itself derived via salt metathesis from ammonium dichromate) yields the chromate following alkalinisation with caesium hydroxide:[2]
Caesium chromate was formerly used in the final stages of creating vacuum tubes. Therein, caesium vapour was produced by reaction of caesium chromate with silicon, boron, or titanium as reducing agents. The vapour was then added to the tube to react with and remove remaining gases, including nitrogen and oxygen.[5]
Seamless Wikipedia browsing. On steroids.
Every time you click a link to Wikipedia, Wiktionary or Wikiquote in your browser's search results, it will show the modern Wikiwand interface.
Wikiwand extension is a five stars, simple, with minimum permission required to keep your browsing private, safe and transparent.