Question #333157

** Question 1**

Compute the net potential energy of a simple Na^{+}Cl^{- }pair. The equilibrium distance between the ions is 0.28nm. The potential energy due to repulsion between electrons is given by U_{r}= β/r^{8}

**Question 2**

*2.1* *α-Co *has an *hcp *structure with lattice spacings of *a= *2.51 A^{o }and c = 4.07 A^{o}, β *Co *is *fcc, *with a cubic lattice spacing of 3.55 A^{o}. What is the difference in density between the two forms?

2.2 Sodium transform from bcc to hcp at about T = 23K. Assuming that the density remains fixed, and the c/ *a *ratio isideal, calculate the *hcp *lattice spacing given that the cubic lattice spacing is *a' *= 4.23 A^{o }in the cubic phase.

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