| 释义 |
holmium Chem.|ˈhəʊlmɪəm|
[mod.L. (P. T. Cleve 1879, in Compt. Rend. LXXXIX. 480), f. Holmia Stockholm (see quot. 1879) + -ium.]
A silvery, relatively soft, metallic element of the lanthanide series which is present in monazite, gadolinite, and other rare-earth minerals and forms a series of strongly para-magnetic salts, mostly of a brown or yellow colour, in which it is trivalent. Atomic number 67; symbol Ho.
1879P. T. Cleve in Chem. News 12 Sept. 126/2, I propose for this metal the name of Holmium, Ho, derived from the latinized name of Stockholm, in the neighbourhood of which so many minerals rich in yttria are to be found. 1886[see dysprosium]. 1893Jrnl. Chem. Soc. LXIV. ii. 467 The holmium oxides were obtained from strongly basic yttrium earths containing a large amount of yttrium oxide. 1924J. W. Mellor Inorg. & Theoret. Chem. V. xxxviii. 696 The four rare earth elements—dysprosium, Dy; holmium, Ho; erbium, Er; and thulium, Tm—are considered as a family or sub-group of the yttrium elements. 1940Nature 20 Apr. 633/1 The investigation of holmium with the mass-spectrograph has shown that the element is composed of one type of atom only, with a mass of 165. 1967[see dysprosium]. |