What is the percentage of free space in a cubic close packed (ccp) structure and in a body-centred c — Solid State Chemistry Question
Question
What is the percentage of free space in a cubic close packed (ccp) structure and in a body-centred cubic (bcc) packed structure, respectively?
Answer: B
💡 Solution & Explanation
The packing efficiency of a CCP (or FCC) structure is $\approx 74\%$, leaving $100\% - 74\% = 26\%$ free space. The packing efficiency of a BCC structure is $\approx 68\%$, leaving $100\% - 68\% = 32\%$ free space.
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