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Show that in the compact hexagonal structure the theoretical axial relationship is c / a =...

Show that in the compact hexagonal structure the theoretical axial relationship is c / a = 1.633. Sodium transforms from bcc to hcp to 23 K. Assuming that the density remains fixed during the transition, find the network constant of the hexagonal phase, since a = 4.23 A in the cubic phase and that the ratio c / a It has the ideal value

solid state physics

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Sodium transforms from bcc to hcp at T = 23 K. Assuming the atomic density remains...
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