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Special formed

Praseodymium  
Formula: Pr
Alias / Keywords: Praseodymium Rod, Praseodymium Metal Rod, Pr Rod, Pr Metal Rod, Praseodymium Tube, Praseodymium Metal Tube, Pr Tube, Pr Metal Tube, Praseodymium Circle, Praseodymium Metal Circle, Pr Circle, Pr Metal Circle, Praseodymium Plate, Praseodymium Metal Plate, Pr Plate, Pr Metal Plate, Praseodymium Disc, Praseodymium Metal Disc, Pr Disc, Pr Metal Disc, Praseodymium Sheet, Praseodymium Metal Sheet, Pr Sheet, Pr Metal Sheet, Praseodymium Foil, Praseodymium Metal Foil, Pr Foil, Pr Metal Foil, Praseodymium Wire, Praseodymium Metal Wire, Pr Wire, Pr Metal Wire, Praseodymium Bar, Praseodymium Metal Bar, Pr Bar, Pr Metal Bar, Praseodymium Powder, Praseodymium Metal Powder, Pr Powder, Pr Metal Powder, Praseodymium Block, Praseodymium Metal Block, Pr Block, Pr Metal Block, Praseodymium Cubit, Praseodymium Metal Cubit, Pr Cubit, Pr Metal Cubit, Praseodymium Crucible, Praseodymium Metal Crucible, Pr Crucible, Pr Metal Crucible
Item no.: 931059
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Praseodymium Metal, is used as high-strength alloying agent in the magnesium used in parts of aircraft engines. It is an important alloying agent in Neodymium-Iron-Boron magnets. Praseodymium is available in many forms including foil, powder, rod, sponge, bar, sheet, and wire.


[Bohr Model of Praseodymium]
Atomic Volume: 20.8W/D
Boiling Point: 3020°C
Compressibility: 3.21x10-6cm2/kg
Covalent Radius: 1.65 Angstroms
Crystal Structure: Hexagonal
Density: 6.77g/cm3
Electrical Resistivity (298°K):68.0 μΩ-cm
Electronegativity: 1.1Pauling's
First Ionization Energy:133K-cal/g-mole
Heat of Fusion: 1.60 k-cal/g-atom
Heat of Vaporization: 79K-cal/g-atom
Magnetic Moment: 3.56Bohr magnetons
Magnetic Susceptibility: 5,320x10-6emu/mole
Melting Point: 935°C
Specific Heat (25°C): 0.048cal/g°C
Standard Electrode Pontential: +2.2volts
Tensile Strength: 15,900psi
Thermal Conductivity (50°C): 0.28cal/cm2/s/°C
Thermal Neutron Cross Section: 11.2barns/atom
Trasformation Temperature: 795°C
Yield Strength: 14,500psi
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Applications

A major use of the metal is in a pyrophoric alloy used in cigarettes lighter flints. Praseodymium compounds have different uses: the oxide is used in Carbon electrodes for arc lighting, and it is know for its ability to give glass a nice yellow colour. This glass filters out the infrared radiation, so it is used in the goggles which protect the eyes of welders. The salts are used to colour enamel and glass. Praseodymium can be used as alloying agent with Magnesium to create high strenght metals that are used in aircraft engines.

Praseodymium is one of the rare chemicals, that can be found in houses in equipment such as colour televisions, fluorescent lamps, energy-saving lamps and glasses. All rare chemicals have comparable properties. The use of Praseodymium is still growing, due to the fact that it is suited to produce catalysers and to polish glass.

Praseodymium in the environment

Praseodymium is one of the more abundant of rare-earth elements. It is four time more abundant than tin. Praseodymium is usually found only in two different kinds of ores.

The major commercial ores in which Praseodymium is found are monazite and bastnasite. The main mining areas are China, USA, Brazil, India, Sri Lanka and Australia. Reserves of Praseodymium are estimated to be around 2 million tonnes. World production of Praseodymium is about 2500 tonnes per year.

Health effects of Praseodymium

Like all rare metals Praseodymium is of low to moderate toxicity. Soluble Praseodymium salts are mildly toxic by ingestion, but insoluble salts are non toxic. They are skin and eye irritants.
Praseodymium is mostly dangerous in the working envIronment, due to the fact that damps and gasses can be inhaled with air. This can cause lung embolisms, especially during long-term exposure. Praseodymium can be a threat to the liver when it accumulates in the human body.

Environmental effects of Praseodymium

Praseodymium is dumped in the environment in many different places, mainly by petrol-producing industries. It can also enter the environment when household equipment is thrown away. Praseodymium will gradually accumulate in soils and water soils and this will eventually lead to increasing concentrations in humans, animals and soil particles.
With water animals Praseodymium causes damage to cell membranes, which has several negative influences on reproduction and on the functions of the nervous system.

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