cristaux.py

Created by elea-rouas33

Created on January 22, 2024

668 Bytes

a=2r
relat° a et r: cubique simple
  a2+a2=4r
  2a2=(4r)2
  2a2=16r2
  a=√8 x r
  a=2√2 x r
cubique face centree  
  a=2r
cristal:repetit° ds les 3dimensions 
de l'espace dun cube appele maille
Vmaille= a3
Vatome,sphere = 4/3πr3
C=NxVsphere /Vmaille
cubique simple:
  N=8x1/8 = 1entité
  C=1x4/3πr3 / a3 
  C=1x4/3πr3 / (2r)3 =0.52
cubique face centree:
  N=8x1/8+6x1/2 = 4entite
  C=4x4/3πr3 / a3
  C=4x4/3πr3 / (4xr/√2)3
  C=4x4/3π / (4/√2)3
  C=0.74
masse volumique:
  p=mcristal/Vcristal
  p=NxM/Na / a3 
maille:+ petite structure permettant
dobtenir le cristal par repetit°
periodiq dans 3D
solide amorphe:pas ordonne
solide cristalin:ordonné

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