| Identification | Back Directory | [Name]
THORIUM OXIDE | [CAS]
1314-20-1 | [Synonyms]
ThO2
Thoria
Thortrast
Umbrathor
thorianite
Thorotrast
Thorium(IV)
dioxothorium
horiumdioxide
diketothorium
THORIUM OXIDE
99.-th)spectro
Thorium(Ⅳ)oxide
Thorium dioxide
thoriumanhydride
Thorium anhydride
thoriumoxide(tho2)
THORIUM (IV) OXIDE
Thorium(IV)dioxide
Thorium(IV)bisoxide
Thorium oxide (ThO2)
thorium oxide 1314-20-1
Thorium dioxide ISO 9001：2015 REACH
Thorium(IV)oxide(99.99%-Th)PURATREM
THORIUM (IV) OXIDE (99.-TH) PURATREM | [EINECS(EC#)]
215-225-1 | [Molecular Formula]
O2Th | [MDL Number]
MFCD00036277 | [MOL File]
1314-20-1.mol | [Molecular Weight]
264.04 |
| Chemical Properties | Back Directory | [Melting point ]
3050°C | [Boiling point ]
4400°C | [density ]
9,86 g/cm3 | [solubility ]
insoluble in H2O, alkaline solutions; slightly soluble in acid solutions | [form ]
white cubic crystals | [color ]
white cubic crystals, crystalline | [Resistivity]
4 ∞ 10*19 (ρ/μΩ.cm) | [Water Solubility ]
insoluble H2O, alkalies [MER06] | [Crystal Structure]
Cubic | [Merck ]
13,9455 | [Dielectric constant]
5.8（21℃） | [EPA Substance Registry System]
Thorium dioxide (1314-20-1) |
| Hazard Information | Back Directory | [Chemical Properties]
Heavy white powder. Mohs hardness
6.5, very refractory. Soluble in sulfuric acid; insoluble
in water. | [Uses]
Ceramics (high temperature), gas mantles,
nuclear fuel, flame spraying, crucibles, medicine,
nonsilica optical glass, catalyst, thoriated tungsten
filaments. | [General Description]
White powder. Density 9.7 g / cm3. Not soluble in water. Used in high-temperature ceramics, gas mantles, nuclear fuel, flame spraying, crucibles, non-silicia optical glass, catalysis, filaments in incandescent lamps, cathodes in electron tubes and arc-melting electrodes. | [Air & Water Reactions]
Insoluble in water. | [Reactivity Profile]
Has only weak oxidizing powers. Redox reactions can however still occur. Not water-reactive. Soluble in sulfuric acid. | [Physical properties]
White cubic crystals; refractive index 2.200 (thorianite); density 10.0 g/cm3; hardness 6.5 Mohs; melts at 3,390°C; vaporizes at 4,400°C; insoluble in water or alkalis; soluble in acids with difficulties. | [Definition]
A white insoluble compound, used
as a refractory, in gas mantles, and as a replacement for silica in some types of optical glass. | [Preparation]
Thorium dioxide is obtained as an intermediate in the production of thorium metal from monazite sand (See Thorium).
The compound also can be prepared by many other methods including thermal decomposition of thorium oxalate, hydroxide, carbonate, or nitrate. Heating thorium metal in oxygen or air, and hydrolysis of thorium halides also yield thorium dioxide. | [Industrial uses]
Thoria, the most chemically stable oxideceramic, is only attacked by some earth alkalimetals under some conditions. It has the highestmelting point (3315°C) of the oxide ceramics.Like beryllia, it is costly. Also, it has highthermal expansion and poor thermal shockresistance. | [Carcinogenicity]
Thorium dioxide is known to be a human carcinogen based on sufficient evidence of carcinogenicity from studies in humans. |
|
|