Question: Beryllium oxide (BeO) may form a crystal structure that consists of an HCP arrangement of O2-ions. If the ionic radius of Be2+ is 0.035 nm,

Beryllium oxide (BeO) may form a crystal structure that consists of an HCP arrangement of O2-ions. If the ionic radius of Be2+ is 0.035 nm, then

(a) Which type of interstitial site will the Be2+ ions occupy?

(b) What fraction of these available interstitial sites will be occupied by Be2+ ions?

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