| 单词 |
dysprosium |
| 释义 |
dysprosium Chem.|dɪˈsprəʊzɪəm|
[mod.L., f. Gr. δυσπρόσιτος difficult of access; named by L. de Boisbaudran 1886, in Compt. Rend. CII. 1004, who showed that the ‘holmium oxide’ of de Cleve was a mixture containing compounds of holmium and of dysprosium (see holmia).]
A paramagnetic metallic element of the lanthanide series, present in yttria-rich minerals such as gadolinite and forming yellowish green salts in which it is trivalent. Symbol Dy; atomic number 66; atomic weight 162·5.
1886Jrnl. Chem. Soc. L. 667 The earths which do not show the bands of holmium but give the bands of dysprosium are relatively rich in terbia. 1906Nature 5 Apr. 551/2 The isolation and some atomic characters of dysprosium. 1962New Scientist 27 Dec. 724 The RCA laser of the solid-state type (using dysprosium in calcium fluoride). 1966Phillips & Williams Inorg. Chem. II. xix. 18 Dysprosium is strongly ferromagnetic below -168° C. and exhibits a remarkable magnetic anisotropy. 1967New Scientist 20 July 158/3 Accurately machined pole-pieces, such as could be turned out of dysprosium or holmium, would ensure better symmetry than currently used iron-free magnet coils. |
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