| http://www.w3.org/ns/prov#value | - A compound having a formula CaGa4 O7 :n%RE, wherein RE is a rare earth selected from the group consisting of Eu, Dy, Tb and combinations thereof, wherein n % is the mole percent of RE present in CaGa4 O7, and spans the range in which said rare earths are soluble in CaGa4 O7.
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