Final Exam – Inorganic Materials Chemistry - Fall 2001   name: …………

   

   

   100 points

   

   

   1. (10 points)  a- Fe has a bcc structure at normal conditions. In the Earth core (Ni-Fe) the
   pressure reaches above 3 Mbar and temperature up to 4500 °C. What crystal structure would you
   expect for Fe under these conditions. Show your reasoning and draw corresponding unit cells.

   

   2. (10 points) List major categories of materials grouped according to their interaction with
   microwave radiation and give specific examples for each category.

   

   3. (10 points) Give a brief explanation the following terms:

   nanoparticle, mesopore, template, adatom, flux, cavitation, mineralizer, micelle,
   self-assembled monolayer, single-source precursor.

   

   4. (40 points) Explain in some detail principles of four of the following six methods and give
   specific examples of reactions.

   1)      Self-propagating high-temperature synthesis (SHS)

   2)      Mechanochemical synthesis

   3)      Chemical vapor deposition (CVD)

   4)      Vapor phase transport (VPT)

   5)      Precursor methods

   6)      Shape selective catalysis

   

   5. (10 points) Which of these polyhedra represents the coordination environment of a metal
   atom (black ball) in:

               a) copper, ccp

               b) magnesium, hcp

   

   


   

   

   

   6. (20 points) A solid state reaction between Ni and NiBi[3] discs leads to the product shown
   below. Consider three cases:

   a) only Ni diffuses through the interfaces

   b) only Bi diffuses through the interfaces

   c) both Ni and Bi diffuse through the interfaces at the same rate


   Calculate for each case the Kirkendall ratio, compare your results with Figure 5, and suggest
   which mechanism is the most plausible.