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How many lattice points are there in one unit cell of each of the following lattice ? (i) Face-centred cubic (ii) Face-centred tetragonal (iii) Body-centred cubic. |
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Answer» Solution :Face-centred cubic or face-centred TETRAGONAL : There are particles on each corner and at the centre of each face in face-centred cubic. Particles per unit cell =`(8xx(1)/(8))+(6xx(1)/(2))=4` Body-centred cubic LATTICE : There are particles on each corner and in the middle of the body of each unit cell. Particles per unit cell = `(8xx(1)/(8))+1 =2` |
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