| http://www.w3.org/ns/prov#value | - In contrast, if ??-sialon is used as matrix material, the metal (Me) (Me is one or more of Li, Ca, Mg, Y and lanthanide metals except for La and Ce) is taken and dissolved in the crystal structure and the metal (Me) is replaced by rare-earth metal, Ce, Pr, Eu, Tb, Yb and Er as luminescence center.
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