What is the planar density in atoms/nm2 in plane (200)? Plane (200)

A crystal has a cubic unit cell of 4.2 Å. Using a wavelength of 1.54 Å at which 2θ value would you expect tomeasure the (111) peak?

A metal has a radius of 0.153 nm, and a planar density of 7.5516551453132 nm-2 in the (110) plane. What is the crystal structure of the material?   a. Something else; atomic radius 0.153 nm b. BCC with atomic radius 0.153 nm c. FCC with atomic radius 0.153 nm d. HCP  with atomic radius 0.153 nm

4.50 Sketch the atomic packing of (a) the (100) plane for the BCC crystal structure, and (b) the (201) plane for the FCC crystal structure (similar to Figures 4.206 and 4.216).

V3 5. Show that the atomic radius of BCC crystal R

Determine the crystal structure for the following: (a) a metal with a0 = 4.9489 Å, r = 1.75 Å and one atom per lattice point; and (b) a metal with a0 = 0.42906 nm, r = 0.1858 nm and one atom per lattice point.

On the basis of these models, explain why diamond is a very hard substance and graphite (e.g. pencil ‘lead’) is very soft.

9. For a two dimensional lattice with, az= a/2 a1= a (a) what is the area of a primitive cell? (b) show that the lattice is a rectangular lattice? (c) draw the Wigner-Seitz cell of this lattice and show that the area of the Wigner-Seitz cell is the same as in (a).

9. For a two dimensional lattice with, a1= a a2= a/2 P- T1/3 (a) what is the area of a primitive cell? (b) show that the lattice is a rectangular lattice? (c) draw the Wigner-Seitz cell of this lattice and show that the area of the Wigner-Seitz cell is the same as in (a).

Given edge lengths and face angles, predict the shape ofeach of the following crystals.a. a = 3 nm, b = 3 nm, c = 3 nm; α = 90°, β° = 90,γ = 90°b. a = 4 nm, b = 3 nm, c = 5 nm; α = 90°, β° = 100,γ = 90°c. a = 3 nm, b = 3 nm, c =5nm; α = 90°, β° = 90 ,γ = 90°d. a = 3 nm, b = 3 nm, c = 5 nm; α = 90°, β° = 90,γ = 120°