Praseodymium Oxide

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Ferro-Molybdenum
Molybdenum Disulfide
Molybdenum Trioxide
Ferro Niobium
Niobium Pentoxide
Lithium Hydroxide
Lithium Carbonate
Manganese Metal Lumps
Electrolytic Manganese Metal Flakes
Low Carbon Ferro Chrome
Chromium Metal
Neodymium Oxide
Cerium Oxide
Cerium Mischmetal
Praseodymium Oxide
Erbium Oxide
Europium Oxide
Dysprosium Oxide
Lanthanum Metal

Praseodymium is a chemical element that has the symbol Pr and atomic number 59. Praseodymium is a soft, silvery, malleable and ductile metal in the lanthanide group. It is too reactive to be found in native form, and when artificially prepared, it slowly develops a green oxide coating.

The element was named for the color of its primary oxide. In 1841, Swedish chemist Carl Gustav Mosander extracted a rare earth oxide residue he called "didymium" from a residue he called "lantana," in turn separated from cerium salts. In 1885, the Austrian chemist Baron Carl Auer von Welsbach separated didymium into two salts of different colors, which he named praseodymium and neodymium. The name praseodymium comes from the Greek prasios meaning green, and didymos twin.

Like most rare earth elements, praseodymium most readily forms trivalent Pr ions. These are yellow-green in water solution, and various shades of yellow-green when incorporated into glasses. Many of praseodymium's industrial uses involve its use to filter yellow light from light sources.

Praseodymium is a soft, silvery, malleable and ductile metal in the lanthanide group. It is somewhat more resistant to corrosion in air than europium, lanthanum, cerium, or neodymium, but it does develop a green oxide coating that spalls off when exposed to air, exposing more metal to oxidation — a centimeter-sized sample of Pr completely oxidizes within a year. For this reason, praseodymium is usually stored under a light mineral oil or sealed in glass.

Item	Parameter	Inspection Analysis
LOI (1000*C)	(wt%)	1.00%
TREO	(wt%)	99.5%
Pr6O11/REC (relative)	(wt%)	99.0%
La2O3	(wt%)	0.0500%
CeO2	(max%)	0.0500%
Nd2O3	(max%)	0.3000%
Sm2O3	(max%)	0.0200%
Eu2O3	(max%)	0.0100%
Gd2O3	(max%)	0.0100%
Tb4O7	(max%)	0.0100%
Dy2O3	(max%)	0.0100%
Y2O3	(max%)	0.0100%
Fe2O3	(max%)	0.0030%
CaO	(max%)	0.0050%
Cuo	(max%)	0.0010%
Nio	(max%)	0.1000%
CI-	(max%)	10.0000%

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