| http://www.w3.org/ns/prov#value | - Composition mol % P2O5 26-55%???SiO2 0-15% GeO2 + TiO2 25-50%???in which GeO2 0-50% TiO2 0-50% ZrO2 0-10% M2O3 0 < 10% Al2O3 0-15% Ga2O3 0-15% Li2O 3-25% and containing a predominant crystalline phase composed of Li1+x(M,Al,Ga)x(Ge1???yTiy)2???x(PO4)3 where X???0.8 and 0???Y???1.0, and where M is an element selected from the group consisting of Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm and Yb and/or and
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