| http://www.w3.org/ns/prov#value | - It is advantageous that the non-magnetic powders as recited above undergo surface treatment with Al2O3, SiO2, TiO2, ZrO2, SnO2, Sb2O3 or ZnO. Of these oxides, Al2O3, SiO2, TiO2 and ZrO2, especially Al2O3, SiO2 and ZrO2, are preferred over the others from the viewpoint of dispersibility.
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