Chapter 5 – Ionic Solids (AxBy solids)
http://www.quimica3d.com/en/access.php - animations of the structures that we talked
about below
 Size of cations and anions; periodic trends in ionic radii
 Ionic crystal structures You will need to know the following structures:
o cesium chloride
o rock-salt (NaCl)
o Zinc-blende (fcc/ccp ZnS)
o fluorite (CaF2)
 for fcc/ccp: octahedral holes, tetrahedral holes (numbers and size)
 You need to be able to translate a description of a structure into a picture and calculate
the fraction of octahedral and tetrahedral holes occupied as well as extract an empirical
formula for a solid from the unit cell contents
 Determine the coordination numbers for the cation (to anions) and anion (to cations)
 Use radius ratio rules to make a prediction of what type of hole a cation (or the smaller
ion) will occupy
 density calculations like for structures of metals.
 calculation of the size of various holes in the lattice.
 Intrinsic defects – Schottky and Frenkel
 Extrinsic defects -Fajan’s rules, polarizing ability of cations, polarization of anions.
 The bonding continuum concept and the bond triangle