| http://www.w3.org/ns/prov#value | - As other materials for the separation layer, silicon oxide or silicate compound, nitride ceramics such as silicon nitride, aluminum nitride and titanium nitride, organic polymeric material (their interatomic bonds should be breakable with exposure of the light), metal such as Al, Li, Ti, Mn, In, Sn, Y, La, Ce, Nd, Pr, Gd and Sm or alloyed metal including at least one of these metals can be used.
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