| 释义 |
iridium|aɪˈrɪdɪəm, ɪ-|
[f. L. īrid- iris 2 + -ium; named by Tennant in 1803 (see quot. 1804).]
A white metal of the platinum group, resembling polished steel, and fusible with great difficulty, found (usually in conjunction with osmium) in native platinum, and in the native alloy iridosmium. Chemical symbol Ir; atomic weight 193. Comb., as iridium-pointed adj.
1804Tennant in Phil. Trans. XCIV. 414, I should incline to call this metal Iridium, from the striking variety of colours which it gives, while dissolving in marine acid. 1805W. H. Wollaston ibid. XCV. 317 Metals that were found by Mr. Tennant..and which he has called Iridium and Osmium. 1849D. Campbell Inorg. Chem. 259 Iridium is not unlike platinum..though harder, and less easily acted upon by acids. 1871Tyndall Fragm. Sc. (1879) II. xvi. 442 When sent through a short bar of iridium, this refractory metal emits a light of extraordinary splendour.
attrib. and Comb.1849D. Campbell Inorg. Chem. 249 To separate the iridium oxide from platinum. 1865–72Watts Dict. Chem. III. 316 The mother-liquor of the iridium-salt. 1897Sears, Roebuck Catal. 433 Gold filled and ebony telescopic Holder, with best quality iridium pointed pens. 1908Daily Chron. 27 Feb. 7/3 A gold-iridium-pointed nib. 1926–7Army & Navy Stores Catal. 425 Fountain pens. Fitted with 14-ct. gold nib, iridium-pointed. |