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Explain three dimensional close packing from two dimensional square close-packing. |
Answer» Solution :THREE dimensional structures is OBTAINED by stacking two dimensional layers ONE above the other.  In this type of arrangement, the second SQUARE closed packed layer is placed exactly above the first square close packed layer such that the spheres of first and second layers are in same alignment horizontally and vertically and in the similar way more layers can be placed one above other. If the arrangement of spheres in the first layer is called ..A.. type, then all the layers have the same arrangement. Thus this lattice has AAAAA.... type arrangement and the lattice thus generated is simple cubic unit CELL or primitive cubic unit cell. The coordination number of each sphere is six. |
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