Fig. 04 shows a hexagonal close packed structure (hcp). (a) Show that for an ideal hep, 2 = 1.633. (b) Show that the packing ratio (or packing efficiency) of hcp is the same as that of fcc structure, that is 0.74. (c) a-Co has an hcp structure with lattice spacing
Fig. 04 shows a hexagonal close packed structure (hcp). (a) Show that for an ideal hep, 2 = 1.633. (b) Show that the packing ratio (or packing efficiency) of hcp is the same as that of fcc structure, that is 0.74. (c) a-Co has an hcp structure with lattice spacing
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SOLID STATE physics
Transcribed Image Text:Fig. 04 shows a hexagonal close packed structure (hcp).
(a)
Show that for an ideal hcp,
2 = 1.633.
(b)
Show that the packing ratio (or packing
efficiency) of hcp is the same as that of fcc
structure, that is 0.74.
a-Co has an hcp structure with lattice spacing
a = 2.51 Å and c = 4.07 A, whereas B-Co is
fcc. What is the difference in density (in %)
between the two forms? (Hint: a-Co obviously
does not have ideal hep structure. Refer your
answer in (b) to see how cla related to density)
(c)
Fig. Q4
(d)
Sodium transform from bcc to hep at about T = 23K. Assuming that the
density remain fixed and the c/a ratio is ideal, calculate the hep lattice spacing
a given that the cubic lattice spacing a'=4.23 Å in the bcc phase.
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