1.25 Aluminium crystallises in a cubic close-packed structure. Its metallic radius is 125 pm.
(ii) How many unit cells are there in 1.00 cm3 of aluminium?
1.24 Aluminium crystallises in a cubic close-packed structure. Its metallic radius is 125 pm.
(i) What is the length of the side of the unit cell?
1.21 Gold (atomic radius = 0.144 nm) crystallises in a face-centred unit cell. What is the length of a side of the cell?
1.20 Classify each of the following as being either a p-type or a n-type semiconductor:
(i) doped with .
1.19 Ferric oxide crystallises in a hexagonal close-packed array of oxide ions with two out of every three octahedral holes occupied by ferric ions. Derive the formula of the ferric oxide.
1.18 Non-stoichiometric cuprous oxide, can be prepared in a laboratory. In this oxide, copper to oxygen ratio is slightly less than 2:1. Can you account for the fact that this substance is a p-type semiconductor?