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Problem: Show how the zinc blende unit cell contains a cation-to-anion ratio of 1:1.

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We are asked how the zinc blende unit cell contains a cation-to-anion ratio of 1:1.

Zinc blende is a face-centered cubic array of anions and cations occupying one-half of the tetrahedral holes

Each ion is 4-coordinate and has local tetrahedral geometry.

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Show how the zinc blende unit cell contains a cation-to-anion ratio of 1:1.

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