Lab2_Crystal Models_Template_1

Lab2_Crystal Models_Template_1 - M Cubic Restrictions a=b=c...

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MSE 2060 S PRING  2010    L AB  2 T EMPLATE    T HE  S EVEN  C RYSTAL  S YSTEMS     Cubic Restrictions:   a = b = c  =   =   = 90 ° α β γ Example: Flourite Lattice type:  Cubic F Atom coordinates: Ca 0,0,0  0, ½ , ½    ½ ,0, ½    ½ , ½ ,0 Lattice parameters:  a, b, c = 5.46  Å F ¼ , ¼ , ¼    ¼ , ¼ , ¾    ¼ , ¾ , ¼    ¼ , ¾ , ¾     =   =   = 90 ° α β γ ¾ , ¼ , ¼    ¾ , ¼ , ¾    ¾ , ¾ , ¼    ¾ , ¾ , ¾                 Plan view Drawing Answer to Question 1: Answer to Question 2: Unit cells
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Tetragonal Restrictions: Example: Rutile Lattice type:  Tetragonal P Atom coordinates*: Ti 0,0,0    ½ , ½ , ½    Lattice parameters:  a, b = 4.59  Å    c = 2.96  Å O 3 / 10 ,  3 / 10 ,0     7 / 10 ,  7 / 10 ,0    =   =   = 90 ° α β γ 8 / 10 ,  2 / 10 , 1 / 2     2 / 10 ,  8 / 10 ,  1 / 2          * These atom coordinates are approximate,  the real rutile unit cell is slightly distorted.
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