Q2(c). Fullerite basis and ammonolysis
(i) The crystalline form of fullerene has a face-centred cubic array of C₆₀ molecules. What is the basis of this unit cell? (ii) What are the products likely to form when Ta₂O₅ is heated at 700 °C in the flow of NH₃ gas?
Answer in brief
(i) One C₆₀ molecule is the basis associated with each fcc lattice point; a conventional cell contains four molecules. (ii) Ta₃N₅ and water form by ammonolysis.
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Coversfullerite C60fcc basisammonolysistantalum nitride Ta3N5molecular crystals
All parts of Question 2
- 2(a) Two perovskite unit-cell origins10 marks
- 2(b) Increasing silicon conductivity10 marks
- 2(c) Fullerite basis and ammonolysis4 marks
- 2(d) Defects and solid-state properties6 marks