D-3. When a block of sodium was subjected to a pressure of 1000 bar from all sides at 300 K, Its structure changed from bcc to fcc. Find the work done (in joules) on 1 cm of sodium block in this process if the metallic radius of sodium remains unchanged in the process.
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Answer:
The pressure-volume relation of sodium is measured up to 100 GPa using high-resolution angle-dispersive synchrotron x-ray diffraction. At a pressure of 65(1) GPa Na is found to undergo a structural phase transition from a body-centered to a face- centered-cubic modification.
Explanation:
Total-energy calculations of Na under pressure are performed using the full-potential linearized augmented plane-wave method. The calculated pressure-volume relations and the bcc-fcc transition pressure are compared to the experimental results
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