On the basis of ionic charge and ionic radii given in Table 3.4, predict crystal structures for the following materials:
(a) CsI
(b) NiO
(c) KI
(d) NiS
Justify your selections.
Table 3.4 Ionic Radii for Several Cations and Anions for a Coordination Number of 6
Cation | Ionic Radius (nm) | Anion | Ionic Radius (nm) |
Al3+ | 0.053 | Br− | 0.196 |
Ba2+ | 0.136 | Cl− | 0.181 |
Ca2+ | 0.100 | F− | 0.133 |
Cs+ | 0.170 | I− | 0.220 |
Fe2+ | 0.077 | O2_ | 0.140 |
Fe3+ | 0.069 | S2_ | 0.184 |
K+ | 0.138 |
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|
Mg2+ | 0.072 |
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|
Mn2+ | 0.067 |
|
|
Na+ | 0.102 |
|
|
Ni2+ | 0.069 |
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|
Si4+ | 0.040 |
|
|
Ti4+ | 0.061 |
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