Question

Starting with a hcp array of anions, what structure types are generated by a) filling all tetrahedral sites with cations, b) filling half of the tetrahedral sites, e.g. T₊, with cations c) filling all octahedral sites with cations and d) filling alternate layers of octahedral sites with cations? Comment on the absence of any known structure type in one of these four categories.

Answer 1

Anwers:-

(a). Filling all tetrahedral sites with cations body centred cubic structure will be generate.

(b). Filling the haf of the tetrahedral sites with cations, the structure will be cubic.

(c). Filling all the octahedral sites with cations, the structure will remain unchanged because there will be no distortion in regular structure.

(d)filling alternate layers of octahedral sites with cations, the structure will be face centred cubic.

there will be absence of body centred cubic structure.