Problem 2 (20 points): CuZn has a disorder-order transition when the temperature changes. When the temperature is high (700 C), it has a body-centered cubic (bcc) lattice, and each lattice site has an equal possibility to be occupied by Cu or Zn, as shown in the left figure. When the temperature is low (20 C), CuZn changes into a perfectly ordered B2 crystal structure, where Cu is at the corner and Zn is at the center of the cubic unit cell, as shown in the right figure. ......... Cu 50% Zn 50% 27 Let's assume the lattice constant is 3.00 at high temperature (700 C) and 2.90 at low temperature (20 C). 1) (10 points) For disordered CuZn crystal structure at high temperature (700 C), predict values of 20 for the two lowest angle peaks in a powder X-Ray Diffraction (XRD) pattern, using Cuka radiation ( = 1.54 ). 2) (10 points) For ordered CuZn crystal structure at low temperature (20 C), predict values of 20 for the two lowest angle peaks in a powder X-Ray Diffraction (XRD) pattern, using Cuka radiation ( = 1.54 ) (Note: Don't use VESTA tools Write down your general calculation stens)