| http://www.w3.org/ns/prov#value | - rare-earth element and Ca, B mainly comprises Mg and C comprises at least one of transition metal elements of Cu, Ni, Co, Fe, Cr, Mn, Ti, V and Zn, x and y representing values within the ranges of 1.5.ltoreq.x.ltoreq.2.5 and2.5.ltoreq.y.ltoreq.3.5, respectively.
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