InterviewSolution
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InterviewSolution
| 1. |
The mineral haematite, ` Fe_(2)O_(3)` consists of a cubic close packed array of oxide ions with `Fe^(3+)` ions occupying intersitial positions. Predict whether the iron ions are in the octahdral or tetrahedral holes. Radius of ` Fe^(3+)` = 0.65Å . |
| Answer» ` r_(+)//r_(-) = 0.65 Å / 1.45 Å `which lies in the range 0.414 - 0.732 Hence, ` Fe^(3+)` ions will be in the octahedral holes. | |