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Doping is most uniformly achieved when the dopant is introduced

  • A.into the solution before precipitation or gelation
  • B.by milling the dopant oxide into the calcined powder
  • C.as a coating sprayed onto the finished granules
  • D.during pressing of the green body

Answer: A

A dopant dissolved with the host cations is distributed atomically from the outset, whereas one milled in afterwards must diffuse from discrete particles during firing. The difference shows up directly in electrical properties.

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