- rare metals
- Смотри редкие металлы.
Энциклопедический словарь по металлургии. — М.: Интермет Инжиниринг. Главный редактор Н.П. Лякишев. 2000.
rare metals
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Rare earth element — Rare earth ore, shown with a United States penny for size comparison These rare … Wikipedia
METALS AND MINING — In the Bible Six metals are mentioned in the Bible and in many passages they are listed in the same order: gold, silver, copper, iron, tin, and lead. Antimony is also mentioned. The metals are referred to in various contexts, including methods of … Encyclopedia of Judaism
rare — [ rar ] adj. • 1377; rere adj. fém. v. 1236; lat. rarus 1 ♦ (Généralt après le nom) Qui se rencontre peu souvent, dont il existe peu d exemplaires. Objet rare. Chercher une chose rare (cf. Mouton à cinq pattes, merle blanc). Pierres rares. ⇒… … Encyclopédie Universelle
rare earth — rer ərth n 1) any of a group of similar oxides of metals or a mixture of such oxides occurring together in widely distributed but relatively scarce minerals 2) RARE EARTH ELEMENT … Medical dictionary
rare-earth element — /rair errth /, Chem. any of a group of closely related metallic elements, comprising the lanthanides, scandium, and yttrium, that are chemically similar by virtue of having the same number of valence electrons. Also called rare earth metal. [1955 … Universalium
Rare Earth hypothesis — In planetary astronomy and astrobiology, the Rare Earth hypothesis argues that the emergence of complex multicellular life (metazoa) on Earth required an improbable combination of astrophysical and geological events and circumstances. The term… … Wikipedia
rare earth metal — Any of a large class of chemical elements including scandium (atomic number 21), yttrium (39), and the 15 elements from 57 (lanthanum) to 71 (see lanthanides). The rare earths themselves are pure or mixed oxides of these metals, originally… … Universalium
rare earth — noun any element of the lanthanide series (atomic numbers 57 through 71) (Freq. 1) • Syn: ↑rare earth element, ↑lanthanoid, ↑lanthanide, ↑lanthanon • Hypernyms: ↑group, ↑grouping … Useful english dictionary
rare-earth element — /rɛər ɜθ ˈɛləmənt/ (say rairr erth eluhmuhnt) noun 1. one of a group of closely related metallic elements of atomic number 57 to 72 inclusive, often divided into three groups: cerium metals (lanthanum, cerium, praseodymium, neodymium, promethium …
rare earth ultra stable Y zeolite — abbr. REUSY A cracking catalyst component made by ion exchanging rare earth (lanthanide) metals into ultra stable type Y molecular sieves. See: rare earth, USY, type Y zeolite … Petroleum refining glossary
