Chapter Imperfections in Crystal

QUESTION 3 a) Crystals are never perfect and contain various types of imperfections and defects that affect many of their physical and mechanical properties. i) Identify the type of defect in diagram (A), (B), and (C) below: OOOOC A B C (3 marks) ii) Diffusivity represent how easily molecules of material A can diffuse to material B. State three (3) factors that influence diffusivity of material. (3 marks) The equilibrium number of vacancies for silver at 800 C is 3.6 x 102 vacancies per cubic meter. The atomic mass and density for silver at this temperature are 107.9 g/mol and 9.5 g/cm3 respectively. Calculate the energy for vacancy formation in silver at 800 "C. Given the: Avogadro Number, NA= 6.023 x 1023 atoms/mol Boltzman constant, ke = 8.62 x 105 eV/K (4 marks)