| http://www.w3.org/ns/prov#value | - A rare earth element represented by symbol M (which is one of the following elements: Sc and Y, which belong to Group 3A of the Periodic Table, and the lanthanoids, including La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Td, Dy, Ho, Er, Tm, Yb, Lu, etc.) and an element represented by symbol M' (which is one of the elements belonging to Groups 4A, 5A and 6A of the Periodic Table, such as Ti.
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