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The sol-gel route to a ceramic powder proceeds through

  • A.milling a coarse powder for many hours
  • B.spraying a slurry into a stream of hot air
  • C.a colloidal sol that is converted into a gel
  • D.melting the oxides at very high temperature

Answer: C

Hydrolysis and condensation of a precursor build a network in solution, which is dried and calcined to give a very fine and homogeneous powder. The precursors are expensive, so the method is used where purity matters more than cost.

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