Table 12.3 Ionic Radii for Several Cations and Anions for a Coordination Number of 6 Cation Ionic Radius (пт) Anion Ionic Radius (nm) Al3+ 0.053 Br 0.196 Ba2+ 0.136 CI 0.181 Ca2+ 0.100 0.133 Cs* 0.170 г 0.220 Fe2+ 0.077 02- 0.140 Fe3+ 0.069 0.184 K* 0.138 Mg+ 0.072 Mn2+ 0.067 Na+ 0.102 Ni2+ 0.069 Si++ 0.040 Ti4+ 0.061

Structural Analysis
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The unit cell for MgFe2O4 (MgO-Fe2O3) has cubic symmetry with a unit cell edge length of 0.836 nm. If the density of this material is 4.52 g/cm3, compute its atomic packing factor. For this computation, you will need to use the ionic radii listed in Table Ionic Radii for Several Cations and Anions for a Coordination Number of 6.

Table 12.3 Ionic Radii for Several Cations and Anions for a
Coordination Number of 6
Cation
Ionic Radius (пт)
Anion
Ionic Radius (nm)
Al3+
0.053
Br
0.196
Ba2+
0.136
CI
0.181
Ca2+
0.100
0.133
Cs*
0.170
г
0.220
Fe2+
0.077
02-
0.140
Fe3+
0.069
0.184
K*
0.138
Mg+
0.072
Mn2+
0.067
Na+
0.102
Ni2+
0.069
Si++
0.040
Ti4+
0.061
Transcribed Image Text:Table 12.3 Ionic Radii for Several Cations and Anions for a Coordination Number of 6 Cation Ionic Radius (пт) Anion Ionic Radius (nm) Al3+ 0.053 Br 0.196 Ba2+ 0.136 CI 0.181 Ca2+ 0.100 0.133 Cs* 0.170 г 0.220 Fe2+ 0.077 02- 0.140 Fe3+ 0.069 0.184 K* 0.138 Mg+ 0.072 Mn2+ 0.067 Na+ 0.102 Ni2+ 0.069 Si++ 0.040 Ti4+ 0.061
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