| http://www.w3.org/ns/prov#value | - The materials more particularly involved are, especially, those of formula AnLnp???xLn???xX(3p+n) in which A, X, n and p have the meaning given above, Ln being chosen from Y, La, Gd, Lu or a mixture of these elements, Ln??? being a dopant, such as Ce or Pr, and x is greater than or equal to 0.01 but less than 1, more generally ranging from 0.01 to 0.9.
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