Question

lattice constants for hexagonal structure are​

Answer 1

Answer:

List of lattice constants

Material Lattice constant (Å) Crystal structure

C (diamond) 3.567 Diamond (FCC)

C (graphite) a = 2.461 c = 6.708 Hexagonal

Si 5.431020511 Diamond (FCC)

Ge 5.658 Diamond (FCC)

Explanation:

J. SSR❤

Answer 2

Answer:

the dhkl spacing for hexagonal structure is calculated by:

dhkl = [(4/3a²)(h²+k²+hk) +(l²/c²)] -1/2

(see for example the book of H. P. Klug and L. E. Alexander; X-ray Diffraction Procedures, Table 1-3)

for d= 2,6A and h=0, k=0 and l=2 you will get c= 5,2 A (your result from above).

The parameter a is not involved for h=0 and k=0.

So you have to take an additional peak position with index h or k not equal to zero