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Magnesia added in small quantity to alumina acts chiefly as

  • A.a colourant for the fired body
  • B.a binder for the green compact
  • C.a grain growth inhibitor
  • D.a fluxing agent that lowers the melting point

Answer: C

It slows boundary movement so that pores are not left behind, which is what makes fully dense translucent alumina possible. The quantity involved is a fraction of a per cent and its discovery was a landmark in ceramic processing.

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