材料科學(xué)基礎(chǔ)英文版課件_(11)-預(yù)覽頁
【正文】 ume = 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 。Chapter Three Structures of Metals and Ceramics Lecturer: Shenhua SONG ? Unit cells ? Metallic crystal structures ? Ceramic crystal structures ? Crystal systems ? Crystallographic directions and planes Unit cells Small repeat atom groups in a crystal structure Representation of a unit cell: (a) hardsphere mode
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