| http://www.w3.org/ns/prov#value | - First, a slurry is prepared by adding fines of rare earth-containing compound, especially rare earth-containing oxide having a Fisher diameter of up to 0.6 ??m and an average particle diameter (primary particle) of 0.01 to 5 ??m, preferably 0.01 to 1 ??m to a medium such as water or alcohol along with a binder.
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