Lanthanum Oxide 99.999%

Описание и отзывы

Характеристики

Lanthanum Oxide La2O3,
CAS:1312-81-8.
EINECS NO. 215-200-5.
MOL FORMULA. La2O3.
MOL WT. 325.82
Appearance White powder, hygroscopic
Density 6.51 g/cm3, solid
Melting point 2315 'C (2588 K)
Boiling point 4200 'C (4500 K)
Solubility : Insoluble in water

chemical data sheet:
lanthanum oxide 99.995%.
TREO(total rare earth oxides):99% min.
Rare-earth impurity
La2O3/ TREO 99.995% min.
None rare-earth impurities
Fe2O3 0.0001% max.
L.O.I. (1000’C, 2 hour):1.0% max.
Packing in 50 kgs drums,inner vacuum packing.

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

Relative products:

Lanthanum Chloride anhydrous ,Cerium chloride, Gadolinium Oxide, Cerium Oxide , Neodymium Oxide , Europium oxide,Erbium Oxide ,Samarium Oxide, Ytterbium Oxide ,Lutetium Oxide ,Terbium Oxide ,Yttrium Oxide, Dysprosium Oxide ......