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Review: Common Metal Structures. hcp. bcc. ccp (fcc). ABCABC. not close-packed. ABABAB. Features Filled outer shells  spherical atom cores, isotropic bonding Maximize number of bonds  high coordination number High density. Ionic Bonding & Structures.

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review common metal structures
Review: Common Metal Structures

hcp

bcc

ccp (fcc)

ABCABC

not close-packed

ABABAB

  • Features
  • Filled outer shells  spherical atom cores, isotropic bonding
  • Maximize number of bonds  high coordination number
  • High density
ionic bonding structures
Ionic Bonding & Structures

Isotropic bonding; alternate anions and cations

Which is more stable?

+

+

+

Just barely stable

slide3

central atom drawn smaller than available space for clarity

http://www.chem.ox.ac.uk/icl/heyes/structure_of_solids/Lecture3/Lec3.html#anchor4

radius ratio rules
Radius Ratio Rules

Consider: CN = 6, 8 12

cuboctahedral cn 12

2RA

rc + RA

Cuboctahedral: CN = 12

rc + RA = 2RA

rc = RA rc/RA = 1

radius ratio rules1
Radius Ratio Rules

if rc is smaller than fRA, then the space is too big and the structure is unstable