boronn.

Brit.

/ˈbɔːrɒn/, U.S.

/ˈbɔˌrɑn/

Etymology: < bor- (in borax n.) + -on (in carbon n.), the element being extracted from borax, and resembling carbon in some of its properties.

Chemistry.

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.

b. Examples in Nuclear Physics.

ΘΚΠ

the world > matter > physics > atomic nucleus > nuclear fission > nuclear fuel > [noun] > protective material

shield1933

boron1938

shielding1945

1938 Proc. Cambr. Philos. Soc. 34 290 (title) The Disintegration of Boron by Slow Neutrons.

1938 Proc. Cambr. Philos. Soc. 34 291 By such measurements on the image of the cloud track resulting from the boron disintegration we have been able to determine the..origin of the He and Li particles.

1949 Rossi & Staub Ionization Chambers & Counters viii. 189 The construction of a highly sensitive boron chamber that can be used for detecting neutrons of all energies.

1949 Rossi & Staub Ionization Chambers & Counters viii. 194 These detectors have been named long boron counters.

1957 Gloss. Terms Nucl. Sci. (A.S.A.) 21/1 Because of its high absorption of neutrons, boron may be used (e.g., in the form of boron steel) as a control absorber in thermal nuclear reactors.

1963 B. Fozard Instrumentation Nucl. Reactors iii. 30 Typical sensitivities for a boron-coated reactor control ionisation chamber.

Draft additions October 2011

boron nitride n. Chemistry the nitride of boron, BN, a solid compound made synthetically and noted for its hardness and stability; cf. aethogen n., borazon n.Boron nitride occurs in several different crystalline forms and as an amorphous powder. Its uses include abrasives, lubricants, cosmetics, and semiconductor devices. The various forms of boron nitride are analogous to the structures of carbon, with which it is isoelectronic.

ΘΚΠ

the world > matter > chemistry > elements and compounds > metals > specific elements > boron > [noun] > compounds

boride1863

boron nitride1868

boron hydride1879

borane1916

borohydride1940

borazon1957

1851 Q. Jrnl. Chem. Soc. 3 167 Balmain..discovered about eight years ago a compound of boron and nitrogen, to which..he gave the analogous name, Æthogen. At a later period, he found that all the bodies which he had described..were one and the same substance, namely nitride of boron.]

1868 H. B. Jones & H. Watts Fownes' Man. Elem. Chem. (ed. 10) 225 Boron Nitride.—This compound, containing 11 parts of boron and 14 of nitrogen, is reduced by heating boric oxide with metallic cyanides.

1922 T. M. Lowry Inorg. Chem. xxix. 516 When heated, boron burns in air or in nitric oxide, forming boric oxide, B₂O₃, and boron nitride, BN, an infusible, insoluble powder.

1961 New Scientist 23 Feb. 484/3 Because of its high thermal stability, boron nitride finds use as a lubricant at very high temperatures when graphite would be decomposed.

2002 Jrnl. Petrol. 43 1790/2 The capsule was placed horizontally in the graphite furnace and packed in boron nitride (BN) to reduce the temperature gradients.

This entry has not yet been fully updated (first published 1887; most recently modified version published online December 2021).

单词	boron
释义	boronn. Brit. /ˈbɔːrɒn/, U.S. /ˈbɔˌrɑn/ Etymology: < bor- (in borax n.) + -on (in carbon n.), the element being extracted from borax, and resembling carbon in some of its properties. Chemistry. 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. b. Examples in Nuclear Physics. ΘΚΠ the world > matter > physics > atomic nucleus > nuclear fission > nuclear fuel > [noun] > protective material shield1933 boron1938 shielding1945 1938 Proc. Cambr. Philos. Soc. 34 290 (title) The Disintegration of Boron by Slow Neutrons. 1938 Proc. Cambr. Philos. Soc. 34 291 By such measurements on the image of the cloud track resulting from the boron disintegration we have been able to determine the..origin of the He and Li particles. 1949 Rossi & Staub Ionization Chambers & Counters viii. 189 The construction of a highly sensitive boron chamber that can be used for detecting neutrons of all energies. 1949 Rossi & Staub Ionization Chambers & Counters viii. 194 These detectors have been named long boron counters. 1957 Gloss. Terms Nucl. Sci. (A.S.A.) 21/1 Because of its high absorption of neutrons, boron may be used (e.g., in the form of boron steel) as a control absorber in thermal nuclear reactors. 1963 B. Fozard Instrumentation Nucl. Reactors iii. 30 Typical sensitivities for a boron-coated reactor control ionisation chamber. Draft additions October 2011 boron nitride n. Chemistry the nitride of boron, BN, a solid compound made synthetically and noted for its hardness and stability; cf. aethogen n., borazon n.Boron nitride occurs in several different crystalline forms and as an amorphous powder. Its uses include abrasives, lubricants, cosmetics, and semiconductor devices. The various forms of boron nitride are analogous to the structures of carbon, with which it is isoelectronic. ΘΚΠ the world > matter > chemistry > elements and compounds > metals > specific elements > boron > [noun] > compounds boride1863 boron nitride1868 boron hydride1879 borane1916 borohydride1940 borazon1957 1851 Q. Jrnl. Chem. Soc. 3 167 Balmain..discovered about eight years ago a compound of boron and nitrogen, to which..he gave the analogous name, Æthogen. At a later period, he found that all the bodies which he had described..were one and the same substance, namely nitride of boron.] 1868 H. B. Jones & H. Watts Fownes' Man. Elem. Chem. (ed. 10) 225 Boron Nitride.—This compound, containing 11 parts of boron and 14 of nitrogen, is reduced by heating boric oxide with metallic cyanides. 1922 T. M. Lowry Inorg. Chem. xxix. 516 When heated, boron burns in air or in nitric oxide, forming boric oxide, B₂O₃, and boron nitride, BN, an infusible, insoluble powder. 1961 New Scientist 23 Feb. 484/3 Because of its high thermal stability, boron nitride finds use as a lubricant at very high temperatures when graphite would be decomposed. 2002 Jrnl. Petrol. 43 1790/2 The capsule was placed horizontally in the graphite furnace and packed in boron nitride (BN) to reduce the temperature gradients. This entry has not yet been fully updated (first published 1887; most recently modified version published online December 2021). < n.1812
随便看	evo-devo evocable evocate evocated evocation evocations evocative evocatively evocativeness evocativenesses evocator evocators evocatory evocatrix evodevo evoe evoes evoid evoke evoked evoker evokers evokes evoking evolate