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单词 rare earth metal
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rare earth metal
rare earth metal n. = rare earth element n.
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1877 Jrnl. Chem. Soc. 31 49 (heading) The quantivalence of the rare earth-metals.
1909 Jrnl. Industr. & Engin. Chem. 1 684/1 A process for obtaining chlorine..consisting in heating at a low temperature ammonium chloride with an oxide of a rare earth metal.
1959 Nomencl. Inorg. Chem. (I.U.P.A.C.) 6 The name rare-earth metals may be used for the elements Sc, Y, and La to Lu inclusive.
1996 Economist 31 Aug. 81/1 Mixed into the glass are small amounts of certain ‘rare-earth’ metals—praseodymium, erbium and thulium—in the form of their ions.
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