Hafnium — lutetium ← hafnium → tantalum Zr ↑ Hf ↓ Rf … Wikipedia
hafnium — /haf nee euhm, hahf /, n. Chem. a gray, toxic metallic element with a high melting point (over 2000°C), found in most zirconium minerals. Symbol: Hf; at. wt.: 178.49; at. no.: 72; sp. gr.: 12.1. [1923; < NL Hafn(ia) Copenhagen + IUM] * * * ▪… … Universalium
Hafnium(IV) chloride — IUPAC name Hafnium(IV) chloride Hafnium tetrachloride … Wikipedia
Carbide — For the software development tool targeting the Symbian OS, see Carbide.c++. Calcium carbide. In chemistry, a carbide is a compound composed of carbon and a less electronegative element. Carbides can be generally classified by chemical bonding… … Wikipedia
Zirconium carbide — Chembox new Name = Zirconium carbide ImageFile = Zirconium(IV) carbide.jpg ImageName = Zirconium carbide OtherNames = zirconium(IV) carbide Section1 = Chembox Identifiers CASNo = 12070 14 3 Section2 = Chembox Properties Formula = ZrC MolarMass =… … Wikipedia
Melting point — For the physical processes that takes place at the melting point, see Melting, Freezing and Crystallization The melting point of a solid is the temperature at which it changes state from solid to liquid. At the melting point the solid and liquid… … Wikipedia
Hot cathode — is also a name for a hot filament ionization gauge, a vacuum measuring device.In vacuum tubes, a hot cathode is a cathode electrode which emits electrons due to thermionic emission. ( Cf. cold cathodes, where field emission is used and which do… … Wikipedia
Solar thermal rocket — Solar thermal propulsion is a form of spacecraft propulsion that makes use of solar power to directly heat reaction mass, and therefore does not require an electrical generator as most other forms of solar powered propulsion do. A solar thermal… … Wikipedia
Refraction (metallurgy) — In metallurgy, refraction is a property of metals that indicates their ability to withstand heat. Metals with a high degree of refraction are referred to as refractory . These metals derive their high melting points from their strong… … Wikipedia
Dictionary of chemical formulas — This is a list of chemical compounds with chemical formulas and CAS numbers, indexed by formula. This complements alternative listings to be found at list of inorganic compounds, list of organic compounds and inorganic compounds by element. Table … Wikipedia
