ZnO have polymorphs of wurtzite and zincblende. The spacegroup for wurtzite ZnO is P63mc. Answer following questions. x) (a) What is Bravais lattice and point group of wurtzite ZnO? Explain the reason. (5pt) (b) The atomic coordinate of Zn is (1/3, 2/3, 0). The atomic coordinate of O is (1/3, 2/3, (x =0.375). How many Zn and O atoms are in unit cell? And what is the atom coordinates of each atoms? (25pt) (c) Draw the unit cell (10pt) P6mc P6 mc a 6mm No. 186 1 x, y, z 2 y, x-y, z 3 x + y, x, z 1 4 x, y, + z 5 x - y, x, 2 6 y, x + y + z 7 y, x, z 8 x + y, y, z 9 x,x-y, z 10 y, x, 1/2 + z 11 x - y, y, 1/2 12 x, x + y, + Z +Z N N +