Lanthanum Oxide

Lanthanum Oxide is used to make optical glasses, to which this oxide confers increased density, refractive index, and hardness. Together with oxides of tungsten, tantalum, and thorium, La2O3 improves the resistance of the glass to attack by alkali. La2O3 is an ingredient for the manufacture of piezoelectric and thermoelectric materials.

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Detailed Description for Lanthanum Oxide

Lanthanum oxide is La2O3, an inorganic compound containing the rare earth element lanthanum and oxygen. It is used to develop ferroelectric materials, as a component of optical materials, and is a feedstock for certain catalysts.

La2O3 has a band gap at approximately 5.8 eV. It has the lowest lattice energy, with very high dielectric constant, ε = 27. La2O3 is widely used in industry as well as in the research laboratory. Lanthanum oxide is an odorless, white solid that is insoluble in water, but soluble in dilute acid. Depending on the pH of the compound, different crystal structures can be obtained.

La2O3 is hygroscopic; under atmosphere, lanthanum oxide absorbs moisture over time and converts to lanthanum hydroxide. Lanthanum oxide has p-type semiconducting properties. Its resistivity decreases with an increase in temperature. Its average room temperature resistivity is 10 kΩ·cm.

PHYSICAL AND CHEMICAL PROPERTIES

PHYSICAL STATE white powder
MELTING POINT > 2300 C
BOILING POINT > 4200 C
SPECIFIC GRAVITY  
SOLUBILITY IN WATER Insoluble (soluble in acid)
pH

 

FLASH POINT  
NFPA RATINGS Health: 1; Flammability: 0; Reactivity: 0
STABILITY Stable under ordinary conditions. Highly hygroscopic.

 

APPEARANCE

white powder

RE PURITY

99.9% min (or upon request)

RE IMPURITY

TREO: 99.0% min

CeO2 : 20ppm max

Pr6O11 : 20ppm max

Nd2O3 : 10ppm max

Sm2O3 : 10ppm max

Y2O3 : 10ppm max

Non-RE IMPURITY

Fe2O3 : 10ppm max

SiO2 : 40ppmmmax

CaO : 30ppm max

CuO : 5ppm max

PbO : 5ppm max

NiO : 4ppm max

Cl- : 300ppm max

 

Uses and applications:

La2O3 is used to make optical glasses, to which this oxide confers increased density, refractive index, and hardness. Together with oxides of tungsten, tantalum, and thorium, La2O3 improves the resistance of the glass to attack by alkali. La2O3 is an ingredient for the manufacture of piezoelectric and thermoelectric materials. Automobile exhaust-gas converters contain La2O3. La2O3 is also used in X-ray imaging intensifying screens, phosphors as well as dielectric and conductive ceramics. Gives of bright glow.

La2O3 has been examined for the oxidative coupling of methane.

La2O3 films can be deposited by many different methods, including: chemical vapor disposition, atomic layer deposition, thermal oxidation, sputtering, and spray pyrolysis. Depositions of these films occur in a temperature range of 250–450 °C. Polycrystalline films are formed at 350 °C.

La2O3 tungsten electrodes are replacing thorianated tungsten electrodes in Gas tungsten arc welding (TIG) due to safety concerns with thorium's radioactivity.


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