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Sol-gel synthesis achieves its homogeneity because mixing happens

  • A.during the long calcination hold that follows
  • B.as the gel is dried and the network collapses
  • C.at the molecular scale in solution
  • D.in a high-energy attrition mill for many hours

Answer: C

The cations are dissolved and linked into one oxide network before any solid forms, so no diffusion distance greater than a few nanometres is ever required. Solid-state mixing, by contrast, leaves distances of microns for diffusion to cross.

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