| 单词 | impurity atom |
| 释义 | > as lemmasimpurity atom impurity atom n. an atom that differs from the bulk of those present in a substance in being of a different element. ΘΚΠ the world > matter > chemistry > atomic chemistry > [noun] > atoms > specific types of atoms functional group1892 species1895 hetero-atom1900 radio-atom1905 isobar1918 donor1927 impurity atom1939 nuclide1947 strong collider1968 1939 A. H. Wilson Semi-conductors & Metals i. 3 The [electrical] resistance in a metal is caused by the scattering of the electrons by irregularities in the crystal; these irregularities may be due to the presence of impurity atoms and strains or to the temperature motion of the atoms. 1949 Physical Rev. 75 866/1 A substitutional impurity atom from the fifth group has one more valence electron than is required to fill the four valence bonds with neighboring silicon atoms. 1970 W. Bollmann Crystal Defects iv. 37 The elementary point defects are vacancies and interstitial atoms, and also impurity atoms. 1972 F. J. Bailey Introd. Semiconductor Devices i. 21 The doping level refers to the ratio of impurity atoms to silicon atoms. For a transistor this may typically be 1:108, i.e. one impurity atom for every hundred million silicon atoms. 1973 Sci. Amer. Feb. 93/2 If other atoms, which can be referred to as impurity atoms if their concentration is relatively small, are introduced into a helium discharge, the random collisions in the discharge will mix the impurity atoms with the helium atoms. < as lemmas |
| 随便看 |
英语词典包含1132095条英英释义在线翻译词条，基本涵盖了全部常用单词的英英翻译及用法，是英语学习的有利工具。