| 单词 | amorphous boron |
| 释义 | > as lemmasamorphous boron a. One of the elementary bodies; a non-metallic solid, not fusible at any known temperature. It is obtained as a dark brown or greenish brown powder ( amorphous boron); and in a less pure form as crystals ( adamantine boron). In some of its properties it resembles carbon and silicon. Symbol B. boron hydride n. any of a series of compounds of boron and hydrogen; at one time considered as potential rocket fuel, and among the earliest examples of electron-deficient compounds; = borane n. ΘΚΠ the world > matter > chemistry > elements and compounds > metals > specific elements > boron > [noun] boracium1808 boron1812 the world > matter > chemistry > elements and compounds > metals > specific elements > boron > [noun] > compounds boride1863 boron nitride1868 boron hydride1879 borane1916 borohydride1940 borazon1957 1812 H. Davy Elements Chem. Philos. 315 I first procured boron in October, 1807, by the electrical decomposition of boracic acid. 1866 H. E. Roscoe Lessons Elem. Chem. xiv. 129 Boron combined with oxygen and sodium is found as borax in nature. 1879 F. Jones in Jrnl. Chem. Soc. XXXV. 41 I am not aware that any attempt has been made since 1809 to obtain boron hydride. 1933 A. Stock Hydrides of Boron & Silicon iii. 40 The yield of boron hydride..was better if they used phosphoric instead of hydrochloric acid for decomposing the boride. 1955 Q. Rev. (Chem. Soc.) 9 176 The boron hydrides and some of their derivatives are examples of electron-deficient compounds. 1961 New Scientist IX. 484 These boron hydrides appeared to be of academic interest only until..the need for rocket fuels became apparent. < as lemmas |
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