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## Homework Statement

Sodium transforms from bcc to hcp at about T=23K. Assuming that the density remains fixed and the c/a ratio is ideal (1.633), calculate the hcp lattice constant a, given that the lattice constant a'=4.23 Angstrom in the cubic phase

## Homework Equations

I cant find any equations regarding this

## The Attempt at a Solution

We haven't gone over this in class so I don't even know where to begin.