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1312-81-8

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Identification

Name
Lanthanum oxide
CAS
1312-81-8
Synonyms
LANTHANUM(+3)OXIDE
LANTHANUM(III) OXIDE
LANTHANUM OXIDE
dilanthanumoxide
dilanthanumtrioxide
Lanthana
lanthania(la2o3)
lanthanumoxide(la2o3)
lanthanumsesquioxide
Lanthanumtrioxide
lanthania
Lanthanum (III) oxide (99.9% La) (REO)
Lanthanum (III) oxide (99.999 La) (REO) PURATREM
LanthanumoxidePURATREM
LanthanumoxideREOwhitepowder
lanthuium trioxide
LANTHANUM OXIDE, NANOPOWDER, <100NM, 99% METALS BASIS
LANTHANUM OXIDE, 99.9+%, AAS GRADE
Lanthanum oxide, 99.99% metals basis
LANTHANUM OXIDE, FOR AAS
EINECS(EC#)
215-200-5
Molecular Formula
La2O3
MDL Number
MFCD00011071
Molecular Weight
325.81
MOL File
1312-81-8.mol

Chemical Properties

Appearance
white powder
Melting point 
2315 °C
mp 
2315 °C
Boiling point 
4200 °C
bp 
4200 °C
density 
6.51 g/mL at 25 °C(lit.)

Fp 
4200°C
storage temp. 
no restrictions.
form 
nanopowder

color 
White to yellow
Specific Gravity
6.51
PH
9.0 (50g/l, H2O, 20℃)(slurry)
Stability:
Stable.
Water Solubility 
INSOLUBLE
Sensitive 
Hygroscopic
Merck 
14,5363
CAS DataBase Reference
1312-81-8(CAS DataBase Reference)
EPA Substance Registry System
1312-81-8(EPA Substance)

Safety Data

Hazard Codes 
Xi
Risk Statements 
R36/37/38:Irritating to eyes, respiratory system and skin .
R36:Irritating to the eyes.
Safety Statements 
S26:In case of contact with eyes, rinse immediately with plenty of water and seek medical advice .
S36:Wear suitable protective clothing .
S39:Wear eye/face protection .
WGK Germany 
1

RTECS 
OE5330000

TSCA 
Yes
HS Code 
28469000
Toxicity
LD50 orally in Rabbit: > 9968 mg/kg

Raw materials And Preparation Products

Material Safety Data Sheet(MSDS)

Questions And Answer

Uses
Lanthanum Oxide, also called Lanthana, high purity Lanthanum Oxide (99.99% to 99.999%) is applied in making special optical glasses to improves the alkali resistance of glass, and is used in La-Ce-Tb phosphors for fluorescent lamps and making special optical glasses, such as infrared-absorbing glass, as well as camera and telescope lenses, Low grade of Lanthanum Oxide is widely used in ceramics and FCC catalyst, and also as raw material for Lanthanum Metal production; Lanthanum Oxide is also used as a grain growth additive during the liquid phase sintering of Silicon Nitride and Zirconium Diboride.

Hazard Information

Chemical Properties
white powder
Physical properties
White amorphous powder; density 6.51 g/cm3; melts at 2,305°C; vaporizes at 4,200°C; insoluble in water; dissolves in dilute mineral acids.
Preparation
Lanthanum oxide can be produced by direct combustion of lanthanum in oxygen or air. The oxide also may be prepared by decomposition of an oxo salt of lanthanum, such as nitrate, sulfate, carbonate, hydroxide or oxalate.
La(CO3)3•8H2O → La2O3 + 3CO2 + 8H2O
2La2(C2O4)3•9H2O + 3O2 → 2La2O3 + 12CO2 + 18H2O
Industrial uses
Lanthanum oxide (La2O3) has a melting pointof 2250°C, is soluble in acids, and very slightlysoluble in water. This oxide of a rare earth elementoccurs in monazite and bastnasite. It ismarketed as the oxide or as other salts such asthe oxalate, nitrate, or hydrate. It quicklyabsorbs water and CO2 from the atmosphere.Its chief use is as an ingredient in nonsilica,rare element optical glass with oxides of tungsten, tantalum, and thorium. Lanthanumincreases refractive index, decreases dispersion,and is also used in x-ray image intensifyingscreens that speed up x-ray exposure asmuch as two to ten times so that diagnosticdosages may be reduced by as much as 80%with fewer retakes. It is also used in bariumtitanate capacitors.

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