1kg Lanthanum (Lathanum) metal 99.9%, rare earth metal

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Lanthanum is a rare earth metal.

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- Purity: min.: 99,5%

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The silvery-white shiny metal is hammerable and ductile. Three metallic modifications exist. Lanthanum is base metal. It is rapidly coated with a white oxide layer in air, which reacts further in moist air to form hydroxide. At temperatures above 440 °C, lanthanum burns to form lanthanum oxide (La2O3). With the formation of hydrogen, a slow reaction takes place in cold water, and a rapid reaction in warm water to form the hydroxide.In dilute acids, lanthanum dissolves with hydrogen evolution.It reacts directly with many elements in the heat, and with halogens already at room temperature. Lanthanum and hydrogen form a black, water-sensitive, non-stoichiometric hydride.

Application

Lanthanum is a component in the mixed metal. Pyrophoric materials for flints contain 25 to 45 percent by weight of lanthanum. It is also used as a reducing agent in metallurgy. As a cast iron additive, it supports the formation of spheroidal graphite, and as an alloying additive it improves oxidation resistance. Lanthanum additions reduce the hardness and temperature sensitivity of molybdenum. High-quality cathodes for generating free electrons consist of lanthanum hexaboride as a substitute for tungsten wire. High-purity lanthanum oxide is used in the glass industry to produce high-quality glasses with a high refractive index for optics, e.g. for camera lenses.

With cobalt:

The cobalt-lanthanum alloy LaCo5 is used as a magnetic material, lanthanum-doped barium titanate for the production of PTC thermistors (temperature-dependent resistors). In combination with cobalt, iron, manganese, strontium, and others, it serves as a cathode for high-temperature fuel cells (SOFCs). "Impure" lanthanum nickel (LaNi5) is used as hydrogen storage in nickel metal hydride accumulators. As an additive, it is found in carbon arc lamps for studio lighting and in film projection equipment (historical use?).

With titanium:

An alloy metal with material compositions of lanthanum and titanium is said to have the effect of reducing chip length during chip forming processing. This is said to facilitate machining of the metal. In the field of medicine, the alloy metal is used to produce corrosion-resistant instruments that can be easily sterilized. This metal alloy with titanium is said to be particularly suitable for tools and apparatus for surgical procedures, since the tendency to allergies when using such metal alloy with titanium is said to be low in comparison with other alloys.

As lanthanum oxide

Production of glasses (lanthanum glass) with comparatively high refractive index, which in turn changes only slightly with wavelength (low dispersion), for cameras, telescope lenses and for eyeglass lenses. Production of crystal glass and porcelain glazes. It replaces more toxic lead compounds with simultaneous improvement of chemical resistance (improvement of alkali resistance, "dishwasher safe") Catalyst addition to zeolites in fluid catalytic cracking in petroleum refinery processing Production of ceramic condenser masses and silicate-free glasses Component of glass polishing agents Production of incandescent cathodes for electron tubes (also lanthanum borides)

As lanthanum carbonate

Drug used to lower phosphate levels in dialysis patients (so-called phosphate binder). Lanthanum is considered to be of low toxicity. A toxic dose is unknown so far. However, lanthanum powder is considered to be highly corrosive because it reacts very easily through e.g. skin moisture to form basic lanthanum hydroxide (similar to the elements calcium and strontium). The lethal dose in rats is 720 mg.

Lanthanum [lanˈtaːn] is a chemical element with the element symbol La and the atomic number 57. It belongs to the transition metals as well as the rare earth metals, in the periodic table it is in the 6th period and the 3rd subgroup (group 3) or scandium group. Mostly it is also counted to the lanthanides, even if the f-shell of the element is unoccupied. Lanthanum (Greek λανθάνειν, lanthanein, "to be hidden") was discovered in 1839 by Swedish chemist and surgeon Carl Gustav Mosander. He obtained lanthanum sulfate from a supposedly pure cernitrate by fractional crystallization.

Symbol: La Electron

configuration: [Xe] 5d¹6s²

Atomic mass: 138.90547 u

Atomic number: 57

Melting point: 920 °C

CAS number: 7439-91-0