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InterviewSolution
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How do you distinguish between hexagonal close - packing and cubic close - packing structures ? |
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Answer» Hexagonal close packing : The spheres of the `3^(rd)` layer are exactly aligned with those of first layer . This pattern of spheres is repeated in alternate layers . Tetrahedral voids of the `2^(nd)` layer may be convered by the spheres of `3^(rd)` layer . This structure is called hexagonal close packed (hcp) structure . Cubic close packing : The spheres of `3^(rd)` layer cover the octehedral voids of `2^(nd)` layer . But the spheres of `4^(th)` layers are aligned with those of first layer . This structure is called cubic close packing . |
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