Name | Cerium Oxide |
Synonyms | opaline nidoral cerium(4+) oxygen(2-) Cerium Oxide CeriumoxideREO CERIUM HYDROXIDE Cerium(IV) oxide Cerium (IV) oxide CERIUM (IV) HYDROXIDE CERIUM (III) HYDROXIDE Ceriumoxideyellowpowder CERIUM (IV) OXIDE HYDRATED Cerium(IV) oxide, dispersion ceric oxide coating quality balzers |
CAS | 1306-38-3 |
EINECS | 215-150-4 |
InChI | InChI=1/Ce.2O/q+4;2*-2 |
InChIKey | CETPSERCERDGAM-UHFFFAOYSA-N |
Molecular Formula | CeO2 |
Molar Mass | 172.1148 |
Density | 7.13g/mLat 25°C(lit.) |
Melting Point | 2600°C |
Water Solubility | insoluble |
Appearance | White powder |
Specific Gravity | 7.132 |
Color | Yellow |
Odor | Odorless |
Merck | 14,1989 |
Storage Condition | Storage temperature: no restrictions. |
Stability | Stable, but absorbs carbon dioxide from the air. |
Sensitive | Easily absorbing moisture |
MDL | MFCD00010933 |
Physical and Chemical Properties | Density 7.132 melting point 2600°C water-soluble insoluble |
Use | Used in glass, atomic energy, electron tube and other industries |
Risk Codes | R36 - Irritating to the eyes R22 - Harmful if swallowed |
Safety Description | S26 - In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. S24/25 - Avoid contact with skin and eyes. S23 - Do not breathe vapour. |
WGK Germany | 3 |
RTECS | FK6310000 |
TSCA | Yes |
HS Code | 28461000 |
Hazard Class | 8 |
Toxicity | LD50 orally in rats: >5.0 g/kg (Lambert) |
Raw Materials | Rare earth oxides |
cerium oxide (Ce2 03) and cerium oxide were common. There is a considerable amount of oxide phase between cerium oxide and cerium oxide, which is unstable. Ceria is the most important and representative oxide of cerium. Has a fluorite structure. Pure product is
White heavy powder or cubic crystal, not pure products because containing trace lanthanum, praseodymium, etc. for light yellow or even pink to red-brown. Melting point 2600 °c. Insoluble in water. Difficult to dissolve in sulfuric acid, nitric acid. Practically insoluble in water and acid. The relative density was 7. 132. Toxic. Cerium trioxide has the hexagonal structure of the rare earth sesquioxide. Melting point 2210 ° C; Boiling point 3730 ° C, mainly used as a catalyst.
with cerium chloride or cerium nitrate as raw material, with ammonia to adjust the pH value of 2, adding oxalic acid to precipitate Cerium oxalate, after heating maturation, separation, washing, drying at 110 ℃, further, it was burned at 900 to 1000 ° C. To form cerium oxide. Cerium trioxide is obtained by heating a mixture of cerium dioxide and carbon powder at a temperature of 1250 ° C. In an atmosphere of carbon monoxide.
cerium oxide is mainly used as a lens polishing agent, and rare earth cerium polishing powder is widely used for polishing of cameras, camera lenses, television picture tubes, ophthalmic lenses, and the like. It can also be used in the glass industry, cerium oxide and titanium dioxide are used in combination to make the glass yellow. Cerium oxide for glass decolorization has the advantages of stable high temperature performance, low price and no visible light absorption. In addition, the addition of cerium oxide to glass for buildings and automobiles can reduce the transmittance of ultraviolet light. For the production of rare earth luminescent materials, CeO2 is added as an activator in the rare earth three primary color fluorescent powder of the luminescent material of the energy-saving lamp and the fluorescent powder used in the indicator lamp and the radiation detector. Cerium oxide is also a raw material for preparing each metal cerium. In addition, it is widely used in semiconductor materials, high-grade pigments, sensitizers for photosensitive glass, and cleaners for automobile exhaust.
rat oral LDso:> 5.0g/kg. Inhalation of dust containing cerium is harmful to the lungs, with occupational pneumoconiosis. The maximum allowable concentration of cerium oxide is 5mg/m3. Staff should be protected. If the skin and eyes are touched, they should be immediately rinsed with flowing water. The working environment should have good ventilation conditions. The substance should be stored in a ventilated, dry place.