Answer to Question #307256 in Solid State Physics for Johannes Steven

Question #307256

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 electron sis given by Ur = β/r8​​​(10)

Question 2

2.1 α-Co has an hcp structure with lattice spacings of a= 2.51 A0 and c = 4.07 A0, β Co is fcc, with a cubic lattice spacing of 3.55 A0. What is the difference in density between the two forms?​​(5)

2.2 Sodium transform from bcc to hcp at about T = 23K. Assuming that the density remains fixed, and the c/ ratio isideal, calculate the hcp lattice spacing given that the cubiclattice spacing a' = 4.23 A0 in the cubic phase.      ​​​​​​​​(5)

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