Question: Consider the atomic packing in the body-centered tetragonal cell. If the ratio c/a is large, then the atoms in the square faces will have their

Consider the atomic packing in the body-centered tetragonal cell. If the ratio c/a is large, then the atoms in the square faces will have their nearest neighbors in the square faces, with the central atom further away. In this range of c/a, what is the atomic packing factor? (Your answer will be a function of c/a.) At what c/a will the central atom also be in contact with the atoms in the square faces?

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