Lanthanum Oxide La2O3 - la2o3

Lanthanum Oxide La2O3,
Properties
Molecular formula La2O3
Molar mass 325.81 g/mol
Appearance White powder, hygroscopic
Density 6.51 g/cm3, solid
Melting point 2315 'C (2588 K)
Boiling point 4200 'C (4500 K)
Solubility in water Insoluble
CAS No.: 1312-81-8



spec typical
TREO: 97% min. 98.5%
La2O3/TREO: 99.9% min. 99.95%
CeO2/ TREO: 0.025% max. 0.01%
Pr6O11/TREO: 0.025% max. 0.01%
Nd2O3/TREO: 0.015% max. 0.01%
Sm2O3/TREO: 0.02% max. 0.003%
Y2O3/TREO: 0.01% max. 0.001%
Fe2O3: 0.02% max. 0.008%
CaO: 0.20% max. 0.07%
Cl: 0.10% max. 0.06%
SiO2: 0.03% max. 0.03%
L.O.I.: 3% max. 1.2%

Synthesis
lanthanum oxide crystallizes as several polymorphs.

To produce hexagonal La2O3, a 0.1 M solution of LaCl3 is sprayed onto a preheated

substrate, usually made of metal chalcogenides.[3] The process can be viewed as occurring

in two steps – hydrolysis followed by dehydration:

2 LaCl3 + 3 H2O → La(OH)3 + 3 HCl
2 La(OH)3 → La2O3 + 3 H2O
An alternative route to hexagonal La2O3 involves precipitation of nominal La(OH)3 from

aqueous solution using a combination of 2.5% NH3 and the surfactant sodium dodecyl sulfate

followed by heating and stirring for 24 hours at 80 °C:

2 LaCl3+ 3 H2O + 3 NH3 → La(OH)3 + 3 NH4Cl
LaCl3·3H2O → La2O3
Other routes include:

2 La2S3 + 3 CO2 → 2 La2O3 + 3 CS2
2 La2(SO4)3 + heat → 2 La2O3 + 6 SO3


Other cations
Scandium(III) oxide
Yttrium(III) oxide
Actinium(III) oxide
Related compounds Lanthanum aluminium oxide,
LaSrCoO4


HENAN KINGWAY CHEMICALS CO.,LTD.
***7,
***8