材料科學(xué)基礎(chǔ)英文版課件_(11)-全文預(yù)覽
【正文】 APF = (ideal packing) Metallic crystal structures (10) Interstices in HCP structures: octahedral interstices and tetrahedral interstices (2/3,1/3,3/4) d e f g e d g f a a Ro = a?2/2 – R = ?2R – R = (a=2R) (2/3,1/3,7/8) Rt = (3/8)c – R = (3/8) –R = (a=2R) 7c/8 Metallic crystal structures (11) Density calculations for metals ? = (weight of atoms in each unit cell)/unit cell voulme = (nA/NA)/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 vol
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