Lab2_Crystal Models_Template_1

Lab2_Crystal Models_Template_1 -...

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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,
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Lab2_Crystal Models_Template_1 -...

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