SULFUR Atomic symbol: S Atomic weight: 32.066 Atomic number: 16 Electron configuration: 2-8-6 Oxidation states: +4, +6, -2 State of matter: solid Non-metal Discovered in ancient times Boils at 444.7°C, melts at 112.8°C Notes: Because sulfur is the least reactive non-metal at room temperature, much occurs free in nature. Chemically combined, sulfur is found as […]
FLUORINE Atomic symbol: F Atomic weight: 18.9984032 Atomic number: 9 Electron configuration: 2-7 Oxidation states: -1 State of matter: gas Non-metal Discovered in 1886 by Henri Moissan Boils at -188°C, freezes at -220°C Notes: Fluorine is the most active member of the halogen family, and produces the most stable compounds. It is very poisonous because […]
HYDROGEN Atomic symbol: H Atomic weight: 1.00794 Atomic number: 1 Electron configuration: 1 Oxidation states: ±1 State of matter: gas Alkali metal Discovered in 1790 by Henry Cavendish Boils at-252.8°C, melts at-259.14°C Notes: Hydrogen is a colorless, odorless, tasteless gas that can be flammable or explosive when mixed with air, oxygen, and chlorine. Hydrogen is not very […]
Rare earth fluorides, metals and slag have strong chemical activity, so the crucible material used must be resistant to corrosion by halogens and their compounds at high temperatures and does not interact with rare earth metals. It can be used for a long time in inert atmosphere. Below we list the chemical stability of different crucible materials […]
Rare earth metals have typical metal properties. They have strong chemical activity and can form a variety of compounds, including hydrides, chlorides, silicides, carbides, organic / inorganic salts and complexes. This is the basis for the rare earth metal in the metallurgical industry as a purification, impurity removal and refinement modifier. Rare earth metals are unstable […]
Molybdenum-rare earth oxide alloy (Mo-REO), also called rare earth molybdenum, is an alloy of molybdenum and rare earth element oxides, which is an oxide dispersion-strengthened alloy, similar to rare earth tungsten. Commonly used rare earth element oxides are Y2O3, La2O3, CeO2, and Nd2O3, Sm2O3, Gd2O3, and Sc2O3. They are usually added in the alloy in an […]
Scandium (Sc, atomic number 21) is a rare earth element with atomic weight 44.955908. Its melting point is 2,806°F (1,541°C). The appearance of its metal form is silvery-white while slightly yellowish or pinkish cast when oxidized in air. It can be dissolved slowly in most dilute acids. Similar to the early founded lanthan and yttrium, in the fullerene […]