| http://www.w3.org/ns/prov#value | - Sources, including commercial sources, of metal oxides such as Al2O3, BaO, CaO, rare earth oxides (e.g., CeO2, Dy2O3, Er2O3, Eu2O3, Gd2O3, Ho2O3, La2O3, Lu2O3, Nd2O3, Pr6O11, Sm2O3, Th4O7, Tm2O3, and Yb2O3, and combinations thereof), TiO2, ZrO2 are known in the art.
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