b) A catalyst comprising of platinum nanoparticles supported on fumed silica was heated in air from 200 to 700 C whilst collecting powder X-ray diffraction data in situ. The diffraction peaks observed become narrower as the temperature was increased. i) Discuss the origin of the diffraction peaks and explain how the width of the peaks can be used to extract information from this experiment ii) Describe the process taking place to account for the differences observed