材料科學(xué)基礎(chǔ)英文版課件_(11)-資料下載頁
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【正文】 A)/Vc n=number of atoms in each unit cell A=atomic weight NA=Avogadro’s number (?1023) Vc=unit cell volume (A/NA=weight of each atom) Metallic crystal structures (12) Density for Cu FCC structure: n=4, A=, a= nm , NA= ?1023 weight of atoms in each unit cell = nA/NA = 4?(?1023) = ?1022 g Unit cell volume = a3 = ()3 = nm3 = ?1023 cm3 ? = (weight of atoms in each unit cell)/unit cell voulme = ?1022 / ?1023 = g/cm3 The literature value is g/cm3 Density for Al FCC structure: n=4, A=, a= nm , NA= ?1023 weight of atoms in each unit cell = nA/NA = 4?(?1023) = ?1022 g Unit cell volume = a3 = () = nm3 = ?1023 cm3 ? = (weight of atoms in each unit cell)/unit cell voulme= g/cm3 The literature value is g/cm3
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