Ucdavisedu chemistrybeloitedu 812013 iitgandhinagar

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Unformatted text preview: linic • Turquoise [(CuAl6(PO4)4(OH)8∙4H2O] Rhodonite [(Mn2+,Fe2+,Mg,Ca)SiO3] 8/1/2013 IIT Gandhinagar 14 Metallic Crystal Structures •Cubic •Body centered cubic (BCC) • Cr, Mo, Ta, α Iron •Face centered cubic (FCC) • Al, Au, Ni, Pt, Ag •Hexagonal •Hexagonal closed packed (HCP) • Zn, Cd, Ti 8/1/2013 IIT Gandhinagar 15 Body Centered Cubic Body Centered Cubic chemwiki.ucdavis.edu chemistry.beloit.edu 8/1/2013 IIT Gandhinagar 16 Body Centered Cubic •Number of atoms per unit cell – 2 •Unit cell length – a= 4R 3 •Atomic packing factor – 0.68 •Coordination number ‐ 8 8/1/2013 IIT Gandhinagar 17 Face Centered Cubic chemwiki.ucdavis.edu chemistry.beloit.edu 8/1/2013 IIT Gandhinagar 18 Face Centered Cubic •Number of atoms per unit cell – 4 a = 2R 2 •Unit cell length – •Atomic packing factor – 0.74 ...
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