Shaillee Kaushal is teaching live on Unacademy Plus
XII 01 Solid State IX
Tetrahedral site: - When one sphere is pla upon the three other spheres w are touching each other, tetrah structure is formed. ed ch ral hole hole This site is very small as compared to the size of the pheres. In hcp and ccp, each sphere is in contact with three spheres abov and three spheres below. hole hole There are two tetrahedral site associates with each sphere.
Octahedral site: This site is formed at the centre of six spheres. >Each octahedral site is formed by superimposing two equilateral triangles with apices in opposite directions. There is one octahedral site for each sphere. The octahedral sites are half of tetrahedral sites.