rare-earth metals
1rare-earth metals — Смотри редкоземельные металлы (РЗМ) …
2Rare earth element — Rare earth ore, shown with a United States penny for size comparison These rare …
3rare-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 …
4rare 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 …
5Rare 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… …
6rare 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 …
7rare 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 …
8rare earth Y zeolite — abbr. REY A cracking catalyst component made by ion exchanging rare earth (lanthanide) metals into sodium Y molecular sieves. See: rare earth, type Y zeolite …
9rare earth — noun Date: 1875 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 …
10rare earth element — noun Any of a group of soft, lustrous, sometimes magnetic metals that form trivalent salts; they include the lanthanides plus yttrium, scandium, thorium and sometimes zirconium. Syn …
